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perl/dist/threads/threads.xs

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#define PERL_NO_GET_CONTEXT
/* Workaround for mingw 32-bit compiler by mingw-w64.sf.net - has to come before any #include.
* It also defines USE_NO_MINGW_SETJMP_TWO_ARGS for the mingw.org 32-bit compilers ... but
* that's ok as that compiler makes no use of that symbol anyway */
#if defined(WIN32) && defined(__MINGW32__) && !defined(__MINGW64__)
# define USE_NO_MINGW_SETJMP_TWO_ARGS 1
#endif
#include "EXTERN.h"
#include "perl.h"
#include "XSUB.h"
/* Workaround for XSUB.h bug under WIN32 */
#ifdef WIN32
# undef setjmp
# if defined(USE_NO_MINGW_SETJMP_TWO_ARGS) || (!defined(__BORLANDC__) && !defined(__MINGW64__))
# define setjmp(x) _setjmp(x)
# endif
# if defined(__MINGW64__)
# define setjmp(x) _setjmpex((x), mingw_getsp())
# endif
#endif
#ifdef HAS_PPPORT_H
# define NEED_PL_signals
# define NEED_sv_2pv_flags
# include "ppport.h"
# include "threads.h"
#endif
#ifndef sv_dup_inc
# define sv_dup_inc(s,t) SvREFCNT_inc(sv_dup(s,t))
#endif
#ifndef PERL_UNUSED_RESULT
# if defined(__GNUC__) && defined(HASATTRIBUTE_WARN_UNUSED_RESULT)
# define PERL_UNUSED_RESULT(v) STMT_START { __typeof__(v) z = (v); (void)sizeof(z); } STMT_END
# else
# define PERL_UNUSED_RESULT(v) ((void)(v))
# endif
#endif
#ifndef CLANG_DIAG_IGNORE
# define CLANG_DIAG_IGNORE(x)
# define CLANG_DIAG_RESTORE
#endif
#ifndef CLANG_DIAG_IGNORE_STMT
# define CLANG_DIAG_IGNORE_STMT(x) CLANG_DIAG_IGNORE(x) NOOP
# define CLANG_DIAG_RESTORE_STMT CLANG_DIAG_RESTORE NOOP
# define CLANG_DIAG_IGNORE_DECL(x) CLANG_DIAG_IGNORE(x) dNOOP
# define CLANG_DIAG_RESTORE_DECL CLANG_DIAG_RESTORE dNOOP
#endif
#ifdef USE_ITHREADS
#ifdef __amigaos4__
# undef YIELD
# define YIELD sleep(0)
#endif
#ifdef WIN32
# include <windows.h>
/* Supposed to be in Winbase.h */
# ifndef STACK_SIZE_PARAM_IS_A_RESERVATION
# define STACK_SIZE_PARAM_IS_A_RESERVATION 0x00010000
# endif
# include <win32thread.h>
#else
# ifdef OS2
typedef perl_os_thread pthread_t;
# else
# include <pthread.h>
# endif
# include <thread.h>
# define PERL_THREAD_SETSPECIFIC(k,v) pthread_setspecific(k,v)
# ifdef OLD_PTHREADS_API
# define PERL_THREAD_DETACH(t) pthread_detach(&(t))
# else
# define PERL_THREAD_DETACH(t) pthread_detach((t))
# endif
#endif
#if !defined(HAS_GETPAGESIZE) && defined(I_SYS_PARAM)
# include <sys/param.h>
#endif
/* Values for 'state' member */
#define PERL_ITHR_DETACHED 1 /* Thread has been detached */
#define PERL_ITHR_JOINED 2 /* Thread is being / has been joined */
#define PERL_ITHR_FINISHED 4 /* Thread has finished execution */
#define PERL_ITHR_THREAD_EXIT_ONLY 8 /* exit() only exits current thread */
#define PERL_ITHR_NONVIABLE 16 /* Thread creation failed */
#define PERL_ITHR_DIED 32 /* Thread finished by dying */
#define PERL_ITHR_UNCALLABLE (PERL_ITHR_DETACHED|PERL_ITHR_JOINED)
typedef struct _ithread {
struct _ithread *next; /* Next thread in the list */
struct _ithread *prev; /* Prev thread in the list */
PerlInterpreter *interp; /* The threads interpreter */
UV tid; /* Threads module's thread id */
perl_mutex mutex; /* Mutex for updating things in this struct */
int count; /* Reference count. See S_ithread_create. */
int state; /* Detached, joined, finished, etc. */
int gimme; /* Context of create */
SV *init_function; /* Code to run */
AV *params; /* Args to pass function */
#ifdef WIN32
DWORD thr; /* OS's idea if thread id */
HANDLE handle; /* OS's waitable handle */
#else
pthread_t thr; /* OS's handle for the thread */
#endif
IV stack_size;
SV *err; /* Error from abnormally terminated thread */
char *err_class; /* Error object's classname if applicable */
#ifndef WIN32
sigset_t initial_sigmask; /* Thread wakes up with signals blocked */
#endif
} ithread;
#define MY_CXT_KEY "threads::_cxt" XS_VERSION
typedef struct {
/* Used by Perl interpreter for thread context switching */
ithread *context;
} my_cxt_t;
START_MY_CXT
#define MY_POOL_KEY "threads::_pool" XS_VERSION
typedef struct {
/* Structure for 'main' thread
* Also forms the 'base' for the doubly-linked list of threads */
ithread main_thread;
/* Protects the creation and destruction of threads*/
perl_mutex create_destruct_mutex;
UV tid_counter;
IV joinable_threads;
IV running_threads;
IV detached_threads;
IV total_threads;
IV default_stack_size;
IV page_size;
} my_pool_t;
#define dMY_POOL \
SV *my_pool_sv = *hv_fetch(PL_modglobal, MY_POOL_KEY, \
sizeof(MY_POOL_KEY)-1, TRUE); \
my_pool_t *my_poolp = INT2PTR(my_pool_t*, SvUV(my_pool_sv))
#define MY_POOL (*my_poolp)
#if defined(WIN32) || (defined(__amigaos4__) && defined(__NEWLIB__))
# undef THREAD_SIGNAL_BLOCKING
#else
# define THREAD_SIGNAL_BLOCKING
#endif
#ifdef THREAD_SIGNAL_BLOCKING
/* Block most signals for calling thread, setting the old signal mask to
* oldmask, if it is not NULL */
STATIC int
S_block_most_signals(sigset_t *oldmask)
{
sigset_t newmask;
sigfillset(&newmask);
/* Don't block certain "important" signals (stolen from mg.c) */
#ifdef SIGILL
sigdelset(&newmask, SIGILL);
#endif
#ifdef SIGBUS
sigdelset(&newmask, SIGBUS);
#endif
#ifdef SIGSEGV
sigdelset(&newmask, SIGSEGV);
#endif
#if defined(VMS)
/* no per-thread blocking available */
return sigprocmask(SIG_BLOCK, &newmask, oldmask);
#else
return pthread_sigmask(SIG_BLOCK, &newmask, oldmask);
#endif /* VMS */
}
/* Set the signal mask for this thread to newmask */
STATIC int
S_set_sigmask(sigset_t *newmask)
{
#if defined(VMS)
return sigprocmask(SIG_SETMASK, newmask, NULL);
#else
return pthread_sigmask(SIG_SETMASK, newmask, NULL);
#endif /* VMS */
}
#endif /* WIN32 */
/* Used by Perl interpreter for thread context switching */
STATIC void
S_ithread_set(pTHX_ ithread *thread)
{
dMY_CXT;
MY_CXT.context = thread;
}
STATIC ithread *
S_ithread_get(pTHX)
{
dMY_CXT;
return (MY_CXT.context);
}
/* Free any data (such as the Perl interpreter) attached to an ithread
* structure. This is a bit like undef on SVs, where the SV isn't freed,
* but the PVX is. Must be called with thread->mutex already locked. Also,
* must be called with MY_POOL.create_destruct_mutex unlocked as destruction
* of the interpreter can lead to recursive destruction calls that could
* lead to a deadlock on that mutex.
*/
STATIC void
S_ithread_clear(pTHX_ ithread *thread)
{
PerlInterpreter *interp;
#ifndef WIN32
sigset_t origmask;
#endif
assert(((thread->state & PERL_ITHR_FINISHED) &&
(thread->state & PERL_ITHR_UNCALLABLE))
||
(thread->state & PERL_ITHR_NONVIABLE));
#ifdef THREAD_SIGNAL_BLOCKING
/* We temporarily set the interpreter context to the interpreter being
* destroyed. It's in no condition to handle signals while it's being
* taken apart.
*/
S_block_most_signals(&origmask);
#endif
interp = thread->interp;
if (interp) {
dTHXa(interp);
PERL_SET_CONTEXT(interp);
S_ithread_set(aTHX_ thread);
SvREFCNT_dec(thread->params);
thread->params = NULL;
if (thread->err) {
SvREFCNT_dec(thread->err);
thread->err = Nullsv;
}
perl_destruct(interp);
perl_free(interp);
thread->interp = NULL;
}
PERL_SET_CONTEXT(aTHX);
#ifdef THREAD_SIGNAL_BLOCKING
S_set_sigmask(&origmask);
#endif
}
/* Decrement the refcount of an ithread, and if it reaches zero, free it.
* Must be called with the mutex held.
* On return, mutex is released (or destroyed).
*/
STATIC void
S_ithread_free(pTHX_ ithread *thread)
PERL_TSA_RELEASE(thread->mutex)
{
#ifdef WIN32
HANDLE handle;
#endif
dMY_POOL;
if (! (thread->state & PERL_ITHR_NONVIABLE)) {
assert(thread->count > 0);
if (--thread->count > 0) {
MUTEX_UNLOCK(&thread->mutex);
return;
}
assert((thread->state & PERL_ITHR_FINISHED) &&
(thread->state & PERL_ITHR_UNCALLABLE));
}
MUTEX_UNLOCK(&thread->mutex);
/* Main thread (0) is immortal and should never get here */
assert(thread->tid != 0);
/* Remove from circular list of threads */
MUTEX_LOCK(&MY_POOL.create_destruct_mutex);
assert(thread->prev && thread->next);
thread->next->prev = thread->prev;
thread->prev->next = thread->next;
thread->next = NULL;
thread->prev = NULL;
MUTEX_UNLOCK(&MY_POOL.create_destruct_mutex);
/* Thread is now disowned */
MUTEX_LOCK(&thread->mutex);
S_ithread_clear(aTHX_ thread);
#ifdef WIN32
handle = thread->handle;
thread->handle = NULL;
#endif
MUTEX_UNLOCK(&thread->mutex);
MUTEX_DESTROY(&thread->mutex);
#ifdef WIN32
if (handle) {
CloseHandle(handle);
}
#endif
PerlMemShared_free(thread);
/* total_threads >= 1 is used to veto cleanup by the main thread,
* should it happen to exit while other threads still exist.
* Decrement this as the very last thing in the thread's existence.
* Otherwise, MY_POOL and global state such as PL_op_mutex may get
* freed while we're still using it.
*/
MUTEX_LOCK(&MY_POOL.create_destruct_mutex);
MY_POOL.total_threads--;
MUTEX_UNLOCK(&MY_POOL.create_destruct_mutex);
}
static void
S_ithread_count_inc(pTHX_ ithread *thread)
PERL_TSA_EXCLUDES(thread->mutex)
{
MUTEX_LOCK(&thread->mutex);
thread->count++;
MUTEX_UNLOCK(&thread->mutex);
}
/* Warn if exiting with any unjoined threads */
STATIC int
S_exit_warning(pTHX)
{
int veto_cleanup, warn;
dMY_POOL;
MUTEX_LOCK(&MY_POOL.create_destruct_mutex);
veto_cleanup = (MY_POOL.total_threads > 0);
warn = (MY_POOL.running_threads || MY_POOL.joinable_threads);
MUTEX_UNLOCK(&MY_POOL.create_destruct_mutex);
if (warn) {
if (ckWARN_d(WARN_THREADS)) {
Perl_warn(aTHX_ "Perl exited with active threads:\n\t%"
IVdf " running and unjoined\n\t%"
IVdf " finished and unjoined\n\t%"
IVdf " running and detached\n",
MY_POOL.running_threads,
MY_POOL.joinable_threads,
MY_POOL.detached_threads);
}
}
return (veto_cleanup);
}
/* Called from perl_destruct() in each thread. If it's the main thread,
* stop it from freeing everything if there are other threads still running.
*/
STATIC int
Perl_ithread_hook(pTHX)
{
dMY_POOL;
return ((aTHX == MY_POOL.main_thread.interp) ? S_exit_warning(aTHX) : 0);
}
/* MAGIC (in mg.h sense) hooks */
STATIC int
ithread_mg_get(pTHX_ SV *sv, MAGIC *mg)
{
ithread *thread = (ithread *)mg->mg_ptr;
SvIV_set(sv, PTR2IV(thread));
SvIOK_on(sv);
return (0);
}
STATIC int
ithread_mg_free(pTHX_ SV *sv, MAGIC *mg)
{
ithread *thread = (ithread *)mg->mg_ptr;
PERL_UNUSED_ARG(sv);
MUTEX_LOCK(&thread->mutex);
S_ithread_free(aTHX_ thread); /* Releases MUTEX */
return (0);
}
STATIC int
ithread_mg_dup(pTHX_ MAGIC *mg, CLONE_PARAMS *param)
{
PERL_UNUSED_ARG(param);
S_ithread_count_inc(aTHX_ (ithread *)mg->mg_ptr);
return (0);
}
STATIC const MGVTBL ithread_vtbl = {
ithread_mg_get, /* get */
0, /* set */
0, /* len */
0, /* clear */
ithread_mg_free, /* free */
0, /* copy */
ithread_mg_dup, /* dup */
#if (PERL_VERSION > 8) || (PERL_VERSION == 8 && PERL_SUBVERSION > 8)
0 /* local */
#endif
};
/* Provided default, minimum and rational stack sizes */
STATIC IV
S_good_stack_size(pTHX_ IV stack_size)
{
dMY_POOL;
/* Use default stack size if no stack size specified */
if (! stack_size) {
return (MY_POOL.default_stack_size);
}
#ifdef PTHREAD_STACK_MIN
/* Can't use less than minimum */
if (stack_size < PTHREAD_STACK_MIN) {
if (ckWARN(WARN_THREADS)) {
Perl_warn(aTHX_ "Using minimum thread stack size of %" IVdf, (IV)PTHREAD_STACK_MIN);
}
return (PTHREAD_STACK_MIN);
}
#endif
/* Round up to page size boundary */
if (MY_POOL.page_size <= 0) {
#if defined(HAS_SYSCONF) && (defined(_SC_PAGESIZE) || defined(_SC_MMAP_PAGE_SIZE))
SETERRNO(0, SS_NORMAL);
# ifdef _SC_PAGESIZE
MY_POOL.page_size = sysconf(_SC_PAGESIZE);
# else
MY_POOL.page_size = sysconf(_SC_MMAP_PAGE_SIZE);
# endif
if ((long)MY_POOL.page_size < 0) {
if (errno) {
SV * const error = get_sv("@", 0);
(void)SvUPGRADE(error, SVt_PV);
Perl_croak(aTHX_ "PANIC: sysconf: %s", SvPV_nolen(error));
} else {
Perl_croak(aTHX_ "PANIC: sysconf: pagesize unknown");
}
}
#else
# ifdef HAS_GETPAGESIZE
MY_POOL.page_size = getpagesize();
# else
# if defined(I_SYS_PARAM) && defined(PAGESIZE)
MY_POOL.page_size = PAGESIZE;
# else
MY_POOL.page_size = 8192; /* A conservative default */
# endif
# endif
if (MY_POOL.page_size <= 0) {
Perl_croak(aTHX_ "PANIC: bad pagesize %" IVdf, (IV)MY_POOL.page_size);
}
#endif
}
stack_size = ((stack_size + (MY_POOL.page_size - 1)) / MY_POOL.page_size) * MY_POOL.page_size;
return (stack_size);
}
/* Run code within a JMPENV environment.
* Using a separate function avoids
* "variable 'foo' might be clobbered by 'longjmp'"
* warnings.
* The three _p vars return values to the caller
*/
static int
S_jmpenv_run(pTHX_ int action, ithread *thread,
int *len_p, int *exit_app_p, int *exit_code_p)
{
dJMPENV;
volatile I32 oldscope = PL_scopestack_ix;
int jmp_rc = 0;
JMPENV_PUSH(jmp_rc);
if (jmp_rc == 0) {
if (action == 0) {
/* Run the specified function */
*len_p = (int)call_sv(thread->init_function, thread->gimme|G_EVAL);
} else if (action == 1) {
/* Warn that thread died */
Perl_warn(aTHX_ "Thread %" UVuf " terminated abnormally: %" SVf, thread->tid, ERRSV);
} else {
/* Warn if there are unjoined threads */
S_exit_warning(aTHX);
}
} else if (jmp_rc == 2) {
/* Thread exited */
*exit_app_p = 1;
*exit_code_p = STATUS_CURRENT;
while (PL_scopestack_ix > oldscope) {
LEAVE;
}
}
JMPENV_POP;
return jmp_rc;
}
/* Starts executing the thread.
* Passed as the C level function to run in the new thread.
*/
#ifdef WIN32
STATIC THREAD_RET_TYPE
S_ithread_run(LPVOID arg)
#else
STATIC void *
S_ithread_run(void * arg)
#endif
{
ithread *thread = (ithread *)arg;
int exit_app = 0; /* Thread terminated using 'exit' */
int exit_code = 0;
int died = 0; /* Thread terminated abnormally */
dTHXa(thread->interp);
dMY_POOL;
/* The following mutex lock + mutex unlock pair explained.
*
* parent:
* - calls ithread_create (and S_ithread_create), which:
* - creates the new thread
* - does MUTEX_LOCK(&thread->mutex)
* - calls pthread_create(..., S_ithread_run,...)
* child:
* - starts the S_ithread_run (where we are now), which:
* - tries to MUTEX_LOCK(&thread->mutex)
* - blocks
* parent:
* - continues doing more createy stuff
* - does MUTEX_UNLOCK(&thread->mutex)
* - continues
* child:
* - finishes MUTEX_LOCK(&thread->mutex)
* - does MUTEX_UNLOCK(&thread->mutex)
* - continues
*/
MUTEX_LOCK(&thread->mutex);
MUTEX_UNLOCK(&thread->mutex);
PERL_SET_CONTEXT(thread->interp);
S_ithread_set(aTHX_ thread);
#ifdef THREAD_SIGNAL_BLOCKING
/* Thread starts with most signals blocked - restore the signal mask from
* the ithread struct.
*/
S_set_sigmask(&thread->initial_sigmask);
#endif
thread_locale_init();
PL_perl_destruct_level = 2;
{
AV *params = thread->params;
int len = (int)av_len(params)+1;
int ii;
int jmp_rc;
dSP;
ENTER;
SAVETMPS;
/* Put args on the stack */
PUSHMARK(SP);
for (ii=0; ii < len; ii++) {
XPUSHs(av_shift(params));
}
PUTBACK;
jmp_rc = S_jmpenv_run(aTHX_ 0, thread, &len, &exit_app, &exit_code);
#ifdef THREAD_SIGNAL_BLOCKING
/* The interpreter is finished, so this thread can stop receiving
* signals. This way, our signal handler doesn't get called in the
* middle of our parent thread calling perl_destruct()...
*/
S_block_most_signals(NULL);
#endif
/* Remove args from stack and put back in params array */
SPAGAIN;
for (ii=len-1; ii >= 0; ii--) {
SV *sv = POPs;
if (jmp_rc == 0 && (thread->gimme & G_WANT) != G_VOID) {
av_store(params, ii, SvREFCNT_inc(sv));
}
}
FREETMPS;
LEAVE;
/* Check for abnormal termination */
if (SvTRUE(ERRSV)) {
died = PERL_ITHR_DIED;
thread->err = newSVsv(ERRSV);
/* If ERRSV is an object, remember the classname and then
* rebless into 'main' so it will survive 'cloning'
*/
if (sv_isobject(thread->err)) {
thread->err_class = HvNAME(SvSTASH(SvRV(thread->err)));
sv_bless(thread->err, gv_stashpv("main", 0));
}
if (ckWARN_d(WARN_THREADS)) {
(void)S_jmpenv_run(aTHX_ 1, thread, NULL,
&exit_app, &exit_code);
}
}
/* Release function ref */
SvREFCNT_dec(thread->init_function);
thread->init_function = Nullsv;
}
PerlIO_flush((PerlIO *)NULL);
MUTEX_LOCK(&MY_POOL.create_destruct_mutex);
MUTEX_LOCK(&thread->mutex);
/* Mark as finished */
thread->state |= (PERL_ITHR_FINISHED | died);
/* Clear exit flag if required */
if (thread->state & PERL_ITHR_THREAD_EXIT_ONLY) {
exit_app = 0;
}
/* Adjust thread status counts */
if (thread->state & PERL_ITHR_DETACHED) {
MY_POOL.detached_threads--;
} else {
MY_POOL.running_threads--;
MY_POOL.joinable_threads++;
}
MUTEX_UNLOCK(&thread->mutex);
MUTEX_UNLOCK(&MY_POOL.create_destruct_mutex);
thread_locale_term();
/* Exit application if required */
if (exit_app) {
(void)S_jmpenv_run(aTHX_ 2, thread, NULL, &exit_app, &exit_code);
my_exit(exit_code);
}
/* At this point, the interpreter may have been freed, so call
* free in the the context of of the 'main' interpreter which
* can't have been freed due to the veto_cleanup mechanism.
*/
aTHX = MY_POOL.main_thread.interp;
MUTEX_LOCK(&thread->mutex);
S_ithread_free(aTHX_ thread); /* Releases MUTEX */
#ifdef WIN32
return ((DWORD)0);
#else
return (0);
#endif
}
/* Type conversion helper functions */
STATIC SV *
S_ithread_to_SV(pTHX_ SV *obj, ithread *thread, char *classname, bool inc)
{
SV *sv;
MAGIC *mg;
if (inc)
S_ithread_count_inc(aTHX_ thread);
if (! obj) {
obj = newSV(0);
}
sv = newSVrv(obj, classname);
sv_setiv(sv, PTR2IV(thread));
mg = sv_magicext(sv, Nullsv, PERL_MAGIC_shared_scalar, &ithread_vtbl, (char *)thread, 0);
mg->mg_flags |= MGf_DUP;
SvREADONLY_on(sv);
return (obj);
}
STATIC ithread *
S_SV_to_ithread(pTHX_ SV *sv)
{
/* Argument is a thread */
if (SvROK(sv)) {
return (INT2PTR(ithread *, SvIV(SvRV(sv))));
}
/* Argument is classname, therefore return current thread */
return (S_ithread_get(aTHX));
}
/* threads->create()
* Called in context of parent thread.
* Called with my_pool->create_destruct_mutex locked.
* (Unlocked both on error and on success.)
*/
STATIC ithread *
S_ithread_create(
PerlInterpreter *parent_perl,
my_pool_t *my_pool,
SV *init_function,
IV stack_size,
int gimme,
int exit_opt,
int params_start,
int num_params)
PERL_TSA_RELEASE(my_pool->create_destruct_mutex)
{
dTHXa(parent_perl);
ithread *thread;
ithread *current_thread = S_ithread_get(aTHX);
AV *params;
SV **array;
#if PERL_VERSION <= 8 && PERL_SUBVERSION <= 7
SV **tmps_tmp = PL_tmps_stack;
IV tmps_ix = PL_tmps_ix;
#endif
#ifndef WIN32
int rc_stack_size = 0;
int rc_thread_create = 0;
#endif
/* Allocate thread structure in context of the main thread's interpreter */
{
PERL_SET_CONTEXT(my_pool->main_thread.interp);
thread = (ithread *)PerlMemShared_malloc(sizeof(ithread));
}
PERL_SET_CONTEXT(aTHX);
if (!thread) {
/* This lock was acquired in ithread_create()
* prior to calling S_ithread_create(). */
MUTEX_UNLOCK(&my_pool->create_destruct_mutex);
{
int fd = PerlIO_fileno(Perl_error_log);
if (fd >= 0) {
/* If there's no error_log, we cannot scream about it missing. */
PERL_UNUSED_RESULT(PerlLIO_write(fd, PL_no_mem, strlen(PL_no_mem)));
}
}
my_exit(1);
}
Zero(thread, 1, ithread);
/* Add to threads list */
thread->next = &my_pool->main_thread;
thread->prev = my_pool->main_thread.prev;
my_pool->main_thread.prev = thread;
thread->prev->next = thread;
my_pool->total_threads++;
/* 1 ref to be held by the local var 'thread' in S_ithread_run().
* 1 ref to be held by the threads object that we assume we will
* be embedded in upon our return.
* 1 ref to be the responsibility of join/detach, so we don't get
* freed until join/detach, even if no thread objects remain.
* This allows the following to work:
* { threads->create(sub{...}); } threads->object(1)->join;
*/
thread->count = 3;
/* Block new thread until ->create() call finishes */
MUTEX_INIT(&thread->mutex);
MUTEX_LOCK(&thread->mutex); /* See S_ithread_run() for more detail. */
thread->tid = my_pool->tid_counter++;
thread->stack_size = S_good_stack_size(aTHX_ stack_size);
thread->gimme = gimme;
thread->state = exit_opt;
/* "Clone" our interpreter into the thread's interpreter.
* This gives thread access to "static data" and code.
*/
PerlIO_flush((PerlIO *)NULL);
S_ithread_set(aTHX_ thread);
SAVEBOOL(PL_srand_called); /* Save this so it becomes the correct value */
PL_srand_called = FALSE; /* Set it to false so we can detect if it gets
set during the clone */
#ifdef THREAD_SIGNAL_BLOCKING
/* perl_clone() will leave us the new interpreter's context. This poses
* two problems for our signal handler. First, it sets the new context
* before the new interpreter struct is fully initialized, so our signal
* handler might find bogus data in the interpreter struct it gets.
* Second, even if the interpreter is initialized before a signal comes in,
* we would like to avoid that interpreter receiving notifications for
* signals (especially when they ought to be for the one running in this
* thread), until it is running in its own thread. Another problem is that
* the new thread will not have set the context until some time after it
* has started, so it won't be safe for our signal handler to run until
* that time.
*
* So we block most signals here, so the new thread will inherit the signal
* mask, and unblock them right after the thread creation. The original
* mask is saved in the thread struct so that the new thread can restore
* the original mask.
*/
S_block_most_signals(&thread->initial_sigmask);
#endif
#ifdef WIN32
thread->interp = perl_clone(aTHX, CLONEf_KEEP_PTR_TABLE | CLONEf_CLONE_HOST);
#else
thread->interp = perl_clone(aTHX, CLONEf_KEEP_PTR_TABLE);
#endif
/* perl_clone() leaves us in new interpreter's context. As it is tricky
* to spot an implicit aTHX, create a new scope with aTHX matching the
* context for the duration of our work for new interpreter.
*/
{
#if (PERL_VERSION > 13) || (PERL_VERSION == 13 && PERL_SUBVERSION > 1)
CLONE_PARAMS *clone_param = Perl_clone_params_new(aTHX, thread->interp);
#else
CLONE_PARAMS clone_param_s;
CLONE_PARAMS *clone_param = &clone_param_s;
#endif
dTHXa(thread->interp);
MY_CXT_CLONE;
#if (PERL_VERSION < 13) || (PERL_VERSION == 13 && PERL_SUBVERSION <= 1)
clone_param->flags = 0;
#endif
/* Here we remove END blocks since they should only run in the thread
* they are created
*/
SvREFCNT_dec(PL_endav);
PL_endav = NULL;
if (SvPOK(init_function)) {
thread->init_function = newSV(0);
sv_copypv(thread->init_function, init_function);
} else {
thread->init_function = sv_dup_inc(init_function, clone_param);
}
thread->params = params = newAV();
av_extend(params, num_params - 1);
AvFILLp(params) = num_params - 1;
array = AvARRAY(params);
/* params_start is an offset onto the Perl stack. This can be
reallocated (and hence move) as a side effect of calls to
perl_clone() and sv_dup_inc(). Hence copy the parameters
somewhere under our control first, before duplicating. */
if (num_params) {
#if (PERL_VERSION > 8)
Copy(parent_perl->Istack_base + params_start, array, num_params, SV *);
#else
Copy(parent_perl->Tstack_base + params_start, array, num_params, SV *);
#endif
while (num_params--) {
*array = sv_dup_inc(*array, clone_param);
++array;
}
}
#if (PERL_VERSION > 13) || (PERL_VERSION == 13 && PERL_SUBVERSION > 1)
Perl_clone_params_del(clone_param);
#endif
#if PERL_VERSION <= 8 && PERL_SUBVERSION <= 7
/* The code below checks that anything living on the tmps stack and
* has been cloned (so it lives in the ptr_table) has a refcount
* higher than 0.
*
* If the refcount is 0 it means that a something on the stack/context
* was holding a reference to it and since we init_stacks() in
* perl_clone that won't get cleaned and we will get a leaked scalar.
* The reason it was cloned was that it lived on the @_ stack.
*
* Example of this can be found in bugreport 15837 where calls in the
* parameter list end up as a temp.
*
* As of 5.8.8 this is done in perl_clone.
*/
while (tmps_ix > 0) {
SV* sv = (SV*)ptr_table_fetch(PL_ptr_table, tmps_tmp[tmps_ix]);
tmps_ix--;
if (sv && SvREFCNT(sv) == 0) {
SvREFCNT_inc_void(sv);
SvREFCNT_dec(sv);
}
}
#endif
SvTEMP_off(thread->init_function);
ptr_table_free(PL_ptr_table);
PL_ptr_table = NULL;
PL_exit_flags |= PERL_EXIT_DESTRUCT_END;
}
S_ithread_set(aTHX_ current_thread);
PERL_SET_CONTEXT(aTHX);
/* Create/start the thread */
#ifdef WIN32
thread->handle = CreateThread(NULL,
(DWORD)thread->stack_size,
S_ithread_run,
(LPVOID)thread,
STACK_SIZE_PARAM_IS_A_RESERVATION,
&thread->thr);
#else
{
STATIC pthread_attr_t attr;
STATIC int attr_inited = 0;
STATIC int attr_joinable = PTHREAD_CREATE_JOINABLE;
if (! attr_inited) {
pthread_attr_init(&attr);
attr_inited = 1;
}
# ifdef PTHREAD_ATTR_SETDETACHSTATE
/* Threads start out joinable */
PTHREAD_ATTR_SETDETACHSTATE(&attr, attr_joinable);
# endif
# ifdef _POSIX_THREAD_ATTR_STACKSIZE
/* Set thread's stack size */
if (thread->stack_size > 0) {
rc_stack_size = pthread_attr_setstacksize(&attr, (size_t)thread->stack_size);
}
# endif
/* Create the thread */
if (! rc_stack_size) {
# ifdef OLD_PTHREADS_API
rc_thread_create = pthread_create(&thread->thr,
attr,
S_ithread_run,
(void *)thread);
# else
# if defined(HAS_PTHREAD_ATTR_SETSCOPE) && defined(PTHREAD_SCOPE_SYSTEM)
pthread_attr_setscope(&attr, PTHREAD_SCOPE_SYSTEM);
# endif
rc_thread_create = pthread_create(&thread->thr,
&attr,
S_ithread_run,
(void *)thread);
# endif
}
#ifdef THREAD_SIGNAL_BLOCKING
/* Now it's safe to accept signals, since we're in our own interpreter's
* context and we have created the thread.
*/
S_set_sigmask(&thread->initial_sigmask);
#endif
# ifdef _POSIX_THREAD_ATTR_STACKSIZE
/* Try to get thread's actual stack size */
{
size_t stacksize;
#ifdef HPUX1020
stacksize = pthread_attr_getstacksize(attr);
#else
if (! pthread_attr_getstacksize(&attr, &stacksize))
#endif
if (stacksize > 0) {
thread->stack_size = (IV)stacksize;
}
}
# endif
}
#endif
/* Check for errors */
#ifdef WIN32
if (thread->handle == NULL) {
#else
if (rc_stack_size || rc_thread_create) {
#endif
/* Must unlock mutex for destruct call */
/* This lock was acquired in ithread_create()
* prior to calling S_ithread_create(). */
MUTEX_UNLOCK(&my_pool->create_destruct_mutex);
thread->state |= PERL_ITHR_NONVIABLE;
S_ithread_free(aTHX_ thread); /* Releases MUTEX */
#ifndef WIN32
if (ckWARN_d(WARN_THREADS)) {
if (rc_stack_size) {
Perl_warn(aTHX_ "Thread creation failed: pthread_attr_setstacksize(%" IVdf ") returned %d", thread->stack_size, rc_stack_size);
} else {
Perl_warn(aTHX_ "Thread creation failed: pthread_create returned %d", rc_thread_create);
}
}
#endif
return (NULL);
}
my_pool->running_threads++;
MUTEX_UNLOCK(&my_pool->create_destruct_mutex);
return (thread);
CLANG_DIAG_IGNORE_STMT(-Wthread-safety);
/* warning: mutex 'thread->mutex' is not held on every path through here [-Wthread-safety-analysis] */
}
CLANG_DIAG_RESTORE_DECL;
#endif /* USE_ITHREADS */
MODULE = threads PACKAGE = threads PREFIX = ithread_
PROTOTYPES: DISABLE
#ifdef USE_ITHREADS
void
ithread_create(...)
PREINIT:
char *classname;
ithread *thread;
SV *function_to_call;
HV *specs;
IV stack_size;
int context;
int exit_opt;
SV *thread_exit_only;
char *str;
int idx;
dMY_POOL;
CODE:
if ((items >= 2) && SvROK(ST(1)) && SvTYPE(SvRV(ST(1)))==SVt_PVHV) {
if (--items < 2) {
Perl_croak(aTHX_ "Usage: threads->create(\\%%specs, function, ...)");
}
specs = (HV*)SvRV(ST(1));
idx = 1;
} else {
if (items < 2) {
Perl_croak(aTHX_ "Usage: threads->create(function, ...)");
}
specs = NULL;
idx = 0;
}
if (sv_isobject(ST(0))) {
/* $thr->create() */
classname = HvNAME(SvSTASH(SvRV(ST(0))));
thread = INT2PTR(ithread *, SvIV(SvRV(ST(0))));
MUTEX_LOCK(&thread->mutex);
stack_size = thread->stack_size;
exit_opt = thread->state & PERL_ITHR_THREAD_EXIT_ONLY;
MUTEX_UNLOCK(&thread->mutex);
} else {
/* threads->create() */
classname = (char *)SvPV_nolen(ST(0));
stack_size = MY_POOL.default_stack_size;
thread_exit_only = get_sv("threads::thread_exit_only", GV_ADD);
exit_opt = (SvTRUE(thread_exit_only))
? PERL_ITHR_THREAD_EXIT_ONLY : 0;
}
function_to_call = ST(idx+1);
context = -1;
if (specs) {
SV **svp;
/* stack_size */
if ((svp = hv_fetchs(specs, "stack", 0))) {
stack_size = SvIV(*svp);
} else if ((svp = hv_fetchs(specs, "stacksize", 0))) {
stack_size = SvIV(*svp);
} else if ((svp = hv_fetchs(specs, "stack_size", 0))) {
stack_size = SvIV(*svp);
}
/* context */
if ((svp = hv_fetchs(specs, "context", 0))) {
str = (char *)SvPV_nolen(*svp);
switch (*str) {
case 'a':
case 'A':
case 'l':
case 'L':
context = G_ARRAY;
break;
case 's':
case 'S':
context = G_SCALAR;
break;
case 'v':
case 'V':
context = G_VOID;
break;
default:
Perl_croak(aTHX_ "Invalid context: %s", str);
}
} else if ((svp = hv_fetchs(specs, "array", 0))) {
if (SvTRUE(*svp)) {
context = G_ARRAY;
}
} else if ((svp = hv_fetchs(specs, "list", 0))) {
if (SvTRUE(*svp)) {
context = G_ARRAY;
}
} else if ((svp = hv_fetchs(specs, "scalar", 0))) {
if (SvTRUE(*svp)) {
context = G_SCALAR;
}
} else if ((svp = hv_fetchs(specs, "void", 0))) {
if (SvTRUE(*svp)) {
context = G_VOID;
}
}
/* exit => thread_only */
if ((svp = hv_fetchs(specs, "exit", 0))) {
str = (char *)SvPV_nolen(*svp);
exit_opt = (*str == 't' || *str == 'T')
? PERL_ITHR_THREAD_EXIT_ONLY : 0;
}
}
if (context == -1) {
context = GIMME_V; /* Implicit context */
} else {
context |= (GIMME_V & (~(G_ARRAY|G_SCALAR|G_VOID)));
}
/* Create thread */
MUTEX_LOCK(&MY_POOL.create_destruct_mutex);
thread = S_ithread_create(aTHX_ &MY_POOL,
function_to_call,
stack_size,
context,
exit_opt,
ax + idx + 2,
items > 2 ? items - 2 : 0);
if (! thread) {
XSRETURN_UNDEF; /* Mutex already unlocked */
}
ST(0) = sv_2mortal(S_ithread_to_SV(aTHX_ Nullsv, thread, classname, FALSE));
/* Let thread run. */
/* See S_ithread_run() for more detail. */
CLANG_DIAG_IGNORE_STMT(-Wthread-safety);
/* warning: releasing mutex 'thread->mutex' that was not held [-Wthread-safety-analysis] */
MUTEX_UNLOCK(&thread->mutex);
CLANG_DIAG_RESTORE_STMT;
/* XSRETURN(1); - implied */
void
ithread_list(...)
PREINIT:
char *classname;
ithread *thread;
int list_context;
IV count = 0;
int want_running = 0;
int state;
dMY_POOL;
PPCODE:
/* Class method only */
if (SvROK(ST(0))) {
Perl_croak(aTHX_ "Usage: threads->list(...)");
}
classname = (char *)SvPV_nolen(ST(0));
/* Calling context */
list_context = (GIMME_V == G_ARRAY);
/* Running or joinable parameter */
if (items > 1) {
want_running = SvTRUE(ST(1));
}
/* Walk through threads list */
MUTEX_LOCK(&MY_POOL.create_destruct_mutex);
for (thread = MY_POOL.main_thread.next;
thread != &MY_POOL.main_thread;
thread = thread->next)
{
MUTEX_LOCK(&thread->mutex);
state = thread->state;
MUTEX_UNLOCK(&thread->mutex);
/* Ignore detached or joined threads */
if (state & PERL_ITHR_UNCALLABLE) {
continue;
}
/* Filter per parameter */
if (items > 1) {
if (want_running) {
if (state & PERL_ITHR_FINISHED) {
continue; /* Not running */
}
} else {
if (! (state & PERL_ITHR_FINISHED)) {
continue; /* Still running - not joinable yet */
}
}
}
/* Push object on stack if list context */
if (list_context) {
XPUSHs(sv_2mortal(S_ithread_to_SV(aTHX_ Nullsv, thread, classname, TRUE)));
}
count++;
}
MUTEX_UNLOCK(&MY_POOL.create_destruct_mutex);
/* If scalar context, send back count */
if (! list_context) {
XSRETURN_IV(count);
}
void
ithread_self(...)
PREINIT:
char *classname;
ithread *thread;
CODE:
/* Class method only */
if ((items != 1) || SvROK(ST(0))) {
Perl_croak(aTHX_ "Usage: threads->self()");
}
classname = (char *)SvPV_nolen(ST(0));
thread = S_ithread_get(aTHX);
ST(0) = sv_2mortal(S_ithread_to_SV(aTHX_ Nullsv, thread, classname, TRUE));
/* XSRETURN(1); - implied */
void
ithread_tid(...)
PREINIT:
ithread *thread;
CODE:
PERL_UNUSED_VAR(items);
thread = S_SV_to_ithread(aTHX_ ST(0));
XST_mUV(0, thread->tid);
/* XSRETURN(1); - implied */
void
ithread_join(...)
PREINIT:
ithread *thread;
ithread *current_thread;
int join_err;
AV *params = NULL;
int len;
int ii;
#ifndef WIN32
int rc_join;
void *retval;
#endif
dMY_POOL;
PPCODE:
/* Object method only */
if ((items != 1) || ! sv_isobject(ST(0))) {
Perl_croak(aTHX_ "Usage: $thr->join()");
}
/* Check if the thread is joinable and not ourselves */
thread = S_SV_to_ithread(aTHX_ ST(0));
current_thread = S_ithread_get(aTHX);
MUTEX_LOCK(&thread->mutex);
if ((join_err = (thread->state & PERL_ITHR_UNCALLABLE))) {
MUTEX_UNLOCK(&thread->mutex);
Perl_croak(aTHX_ (join_err & PERL_ITHR_DETACHED)
? "Cannot join a detached thread"
: "Thread already joined");
} else if (thread->tid == current_thread->tid) {
MUTEX_UNLOCK(&thread->mutex);
Perl_croak(aTHX_ "Cannot join self");
}
/* Mark as joined */
thread->state |= PERL_ITHR_JOINED;
MUTEX_UNLOCK(&thread->mutex);
MUTEX_LOCK(&MY_POOL.create_destruct_mutex);
MY_POOL.joinable_threads--;
MUTEX_UNLOCK(&MY_POOL.create_destruct_mutex);
/* Join the thread */
#ifdef WIN32
if (WaitForSingleObject(thread->handle, INFINITE) != WAIT_OBJECT_0) {
/* Timeout/abandonment unexpected here; check $^E */
Perl_croak(aTHX_ "PANIC: underlying join failed");
};
#else
if ((rc_join = pthread_join(thread->thr, &retval)) != 0) {
/* In progress/deadlock/unknown unexpected here; check $! */
errno = rc_join;
Perl_croak(aTHX_ "PANIC: underlying join failed");
};
#endif
MUTEX_LOCK(&thread->mutex);
/* Get the return value from the call_sv */
/* Objects do not survive this process - FIXME */
if ((thread->gimme & G_WANT) != G_VOID) {
#if (PERL_VERSION < 13) || (PERL_VERSION == 13 && PERL_SUBVERSION <= 1)
AV *params_copy;
PerlInterpreter *other_perl;
CLONE_PARAMS clone_params;
params_copy = thread->params;
other_perl = thread->interp;
clone_params.stashes = newAV();
clone_params.flags = CLONEf_JOIN_IN;
PL_ptr_table = ptr_table_new();
S_ithread_set(aTHX_ thread);
/* Ensure 'meaningful' addresses retain their meaning */
ptr_table_store(PL_ptr_table, &other_perl->Isv_undef, &PL_sv_undef);
ptr_table_store(PL_ptr_table, &other_perl->Isv_no, &PL_sv_no);
ptr_table_store(PL_ptr_table, &other_perl->Isv_yes, &PL_sv_yes);
params = (AV *)sv_dup((SV*)params_copy, &clone_params);
S_ithread_set(aTHX_ current_thread);
SvREFCNT_dec(clone_params.stashes);
SvREFCNT_inc_void(params);
ptr_table_free(PL_ptr_table);
PL_ptr_table = NULL;
#else
AV *params_copy;
PerlInterpreter *other_perl = thread->interp;
CLONE_PARAMS *clone_params = Perl_clone_params_new(other_perl, aTHX);
params_copy = thread->params;
clone_params->flags |= CLONEf_JOIN_IN;
PL_ptr_table = ptr_table_new();
S_ithread_set(aTHX_ thread);
/* Ensure 'meaningful' addresses retain their meaning */
ptr_table_store(PL_ptr_table, &other_perl->Isv_undef, &PL_sv_undef);
ptr_table_store(PL_ptr_table, &other_perl->Isv_no, &PL_sv_no);
ptr_table_store(PL_ptr_table, &other_perl->Isv_yes, &PL_sv_yes);
# ifdef PL_sv_zero
ptr_table_store(PL_ptr_table, &other_perl->Isv_zero, &PL_sv_zero);
# endif
params = (AV *)sv_dup((SV*)params_copy, clone_params);
S_ithread_set(aTHX_ current_thread);
Perl_clone_params_del(clone_params);
SvREFCNT_inc_void(params);
ptr_table_free(PL_ptr_table);
PL_ptr_table = NULL;
#endif
}
/* If thread didn't die, then we can free its interpreter */
if (! (thread->state & PERL_ITHR_DIED)) {
S_ithread_clear(aTHX_ thread);
}
S_ithread_free(aTHX_ thread); /* Releases MUTEX */
/* If no return values, then just return */
if (! params) {
XSRETURN_UNDEF;
}
/* Put return values on stack */
len = (int)AvFILL(params);
for (ii=0; ii <= len; ii++) {
SV* param = av_shift(params);
XPUSHs(sv_2mortal(param));
}
/* Free return value array */
SvREFCNT_dec(params);
void
ithread_yield(...)
CODE:
PERL_UNUSED_VAR(items);
YIELD;
void
ithread_detach(...)
PREINIT:
ithread *thread;
int detach_err;
dMY_POOL;
CODE:
PERL_UNUSED_VAR(items);
/* Detach the thread */
thread = S_SV_to_ithread(aTHX_ ST(0));
MUTEX_LOCK(&MY_POOL.create_destruct_mutex);
MUTEX_LOCK(&thread->mutex);
if (! (detach_err = (thread->state & PERL_ITHR_UNCALLABLE))) {
/* Thread is detachable */
thread->state |= PERL_ITHR_DETACHED;
#ifdef WIN32
/* Windows has no 'detach thread' function */
#else
PERL_THREAD_DETACH(thread->thr);
#endif
if (thread->state & PERL_ITHR_FINISHED) {
MY_POOL.joinable_threads--;
} else {
MY_POOL.running_threads--;
MY_POOL.detached_threads++;
}
}
MUTEX_UNLOCK(&thread->mutex);
MUTEX_UNLOCK(&MY_POOL.create_destruct_mutex);
if (detach_err) {
Perl_croak(aTHX_ (detach_err & PERL_ITHR_DETACHED)
? "Thread already detached"
: "Cannot detach a joined thread");
}
/* If thread is finished and didn't die,
* then we can free its interpreter */
MUTEX_LOCK(&thread->mutex);
if ((thread->state & PERL_ITHR_FINISHED) &&
! (thread->state & PERL_ITHR_DIED))
{
S_ithread_clear(aTHX_ thread);
}
S_ithread_free(aTHX_ thread); /* Releases MUTEX */
void
ithread_kill(...)
PREINIT:
ithread *thread;
char *sig_name;
IV signal;
int no_handler = 1;
CODE:
/* Must have safe signals */
if (PL_signals & PERL_SIGNALS_UNSAFE_FLAG) {
Perl_croak(aTHX_ "Cannot signal threads without safe signals");
}
/* Object method only */
if ((items != 2) || ! sv_isobject(ST(0))) {
Perl_croak(aTHX_ "Usage: $thr->kill('SIG...')");
}
/* Get signal */
sig_name = SvPV_nolen(ST(1));
if (isALPHA(*sig_name)) {
if (*sig_name == 'S' && sig_name[1] == 'I' && sig_name[2] == 'G') {
sig_name += 3;
}
if ((signal = whichsig(sig_name)) < 0) {
Perl_croak(aTHX_ "Unrecognized signal name: %s", sig_name);
}
} else {
signal = SvIV(ST(1));
}
/* Set the signal for the thread */
thread = S_SV_to_ithread(aTHX_ ST(0));
MUTEX_LOCK(&thread->mutex);
if (thread->interp && ! (thread->state & PERL_ITHR_FINISHED)) {
dTHXa(thread->interp);
if (PL_psig_pend && PL_psig_ptr[signal]) {
PL_psig_pend[signal]++;
PL_sig_pending = 1;
no_handler = 0;
}
} else {
/* Ignore signal to terminated/finished thread */
no_handler = 0;
}
MUTEX_UNLOCK(&thread->mutex);
if (no_handler) {
Perl_croak(aTHX_ "Signal %s received in thread %" UVuf
", but no signal handler set.",
sig_name, thread->tid);
}
/* Return the thread to allow for method chaining */
ST(0) = ST(0);
/* XSRETURN(1); - implied */
void
ithread_DESTROY(...)
CODE:
PERL_UNUSED_VAR(items);
sv_unmagic(SvRV(ST(0)), PERL_MAGIC_shared_scalar);
void
ithread_equal(...)
PREINIT:
int are_equal = 0;
CODE:
PERL_UNUSED_VAR(items);
/* Compares TIDs to determine thread equality */
if (sv_isobject(ST(0)) && sv_isobject(ST(1))) {
ithread *thr1 = INT2PTR(ithread *, SvIV(SvRV(ST(0))));
ithread *thr2 = INT2PTR(ithread *, SvIV(SvRV(ST(1))));
are_equal = (thr1->tid == thr2->tid);
}
if (are_equal) {
XST_mYES(0);
} else {
/* Return 0 on false for backward compatibility */
XST_mIV(0, 0);
}
/* XSRETURN(1); - implied */
void
ithread_object(...)
PREINIT:
char *classname;
SV *arg;
UV tid;
ithread *thread;
int state;
int have_obj = 0;
dMY_POOL;
CODE:
/* Class method only */
if (SvROK(ST(0))) {
Perl_croak(aTHX_ "Usage: threads->object($tid)");
}
classname = (char *)SvPV_nolen(ST(0));
/* Turn $tid from PVLV to SV if needed (bug #73330) */
arg = ST(1);
SvGETMAGIC(arg);
if ((items < 2) || ! SvOK(arg)) {
XSRETURN_UNDEF;
}
/* threads->object($tid) */
tid = SvUV(arg);
/* If current thread wants its own object, then behave the same as
->self() */
thread = S_ithread_get(aTHX);
if (thread->tid == tid) {
ST(0) = sv_2mortal(S_ithread_to_SV(aTHX_ Nullsv, thread, classname, TRUE));
have_obj = 1;
} else {
/* Walk through threads list */
MUTEX_LOCK(&MY_POOL.create_destruct_mutex);
for (thread = MY_POOL.main_thread.next;
thread != &MY_POOL.main_thread;
thread = thread->next)
{
/* Look for TID */
if (thread->tid == tid) {
/* Ignore if detached or joined */
MUTEX_LOCK(&thread->mutex);
state = thread->state;
MUTEX_UNLOCK(&thread->mutex);
if (! (state & PERL_ITHR_UNCALLABLE)) {
/* Put object on stack */
ST(0) = sv_2mortal(S_ithread_to_SV(aTHX_ Nullsv, thread, classname, TRUE));
have_obj = 1;
}
break;
}
}
MUTEX_UNLOCK(&MY_POOL.create_destruct_mutex);
}
if (! have_obj) {
XSRETURN_UNDEF;
}
/* XSRETURN(1); - implied */
void
ithread__handle(...);
PREINIT:
ithread *thread;
CODE:
PERL_UNUSED_VAR(items);
thread = S_SV_to_ithread(aTHX_ ST(0));
#ifdef WIN32
XST_mUV(0, PTR2UV(&thread->handle));
#else
XST_mUV(0, PTR2UV(&thread->thr));
#endif
/* XSRETURN(1); - implied */
void
ithread_get_stack_size(...)
PREINIT:
IV stack_size;
dMY_POOL;
CODE:
PERL_UNUSED_VAR(items);
if (sv_isobject(ST(0))) {
/* $thr->get_stack_size() */
ithread *thread = INT2PTR(ithread *, SvIV(SvRV(ST(0))));
stack_size = thread->stack_size;
} else {
/* threads->get_stack_size() */
stack_size = MY_POOL.default_stack_size;
}
XST_mIV(0, stack_size);
/* XSRETURN(1); - implied */
void
ithread_set_stack_size(...)
PREINIT:
IV old_size;
dMY_POOL;
CODE:
if (items != 2) {
Perl_croak(aTHX_ "Usage: threads->set_stack_size($size)");
}
if (sv_isobject(ST(0))) {
Perl_croak(aTHX_ "Cannot change stack size of an existing thread");
}
if (! looks_like_number(ST(1))) {
Perl_croak(aTHX_ "Stack size must be numeric");
}
old_size = MY_POOL.default_stack_size;
MY_POOL.default_stack_size = S_good_stack_size(aTHX_ SvIV(ST(1)));
XST_mIV(0, old_size);
/* XSRETURN(1); - implied */
void
ithread_is_running(...)
PREINIT:
ithread *thread;
CODE:
/* Object method only */
if ((items != 1) || ! sv_isobject(ST(0))) {
Perl_croak(aTHX_ "Usage: $thr->is_running()");
}
thread = INT2PTR(ithread *, SvIV(SvRV(ST(0))));
MUTEX_LOCK(&thread->mutex);
ST(0) = (thread->state & PERL_ITHR_FINISHED) ? &PL_sv_no : &PL_sv_yes;
MUTEX_UNLOCK(&thread->mutex);
/* XSRETURN(1); - implied */
void
ithread_is_detached(...)
PREINIT:
ithread *thread;
CODE:
PERL_UNUSED_VAR(items);
thread = S_SV_to_ithread(aTHX_ ST(0));
MUTEX_LOCK(&thread->mutex);
ST(0) = (thread->state & PERL_ITHR_DETACHED) ? &PL_sv_yes : &PL_sv_no;
MUTEX_UNLOCK(&thread->mutex);
/* XSRETURN(1); - implied */
void
ithread_is_joinable(...)
PREINIT:
ithread *thread;
CODE:
/* Object method only */
if ((items != 1) || ! sv_isobject(ST(0))) {
Perl_croak(aTHX_ "Usage: $thr->is_joinable()");
}
thread = INT2PTR(ithread *, SvIV(SvRV(ST(0))));
MUTEX_LOCK(&thread->mutex);
ST(0) = ((thread->state & PERL_ITHR_FINISHED) &&
! (thread->state & PERL_ITHR_UNCALLABLE))
? &PL_sv_yes : &PL_sv_no;
MUTEX_UNLOCK(&thread->mutex);
/* XSRETURN(1); - implied */
void
ithread_wantarray(...)
PREINIT:
ithread *thread;
CODE:
PERL_UNUSED_VAR(items);
thread = S_SV_to_ithread(aTHX_ ST(0));
ST(0) = ((thread->gimme & G_WANT) == G_ARRAY) ? &PL_sv_yes :
((thread->gimme & G_WANT) == G_VOID) ? &PL_sv_undef
/* G_SCALAR */ : &PL_sv_no;
/* XSRETURN(1); - implied */
void
ithread_set_thread_exit_only(...)
PREINIT:
ithread *thread;
CODE:
if (items != 2) {
Perl_croak(aTHX_ "Usage: ->set_thread_exit_only(boolean)");
}
thread = S_SV_to_ithread(aTHX_ ST(0));
MUTEX_LOCK(&thread->mutex);
if (SvTRUE(ST(1))) {
thread->state |= PERL_ITHR_THREAD_EXIT_ONLY;
} else {
thread->state &= ~PERL_ITHR_THREAD_EXIT_ONLY;
}
MUTEX_UNLOCK(&thread->mutex);
void
ithread_error(...)
PREINIT:
ithread *thread;
SV *err = NULL;
CODE:
/* Object method only */
if ((items != 1) || ! sv_isobject(ST(0))) {
Perl_croak(aTHX_ "Usage: $thr->err()");
}
thread = INT2PTR(ithread *, SvIV(SvRV(ST(0))));
MUTEX_LOCK(&thread->mutex);
/* If thread died, then clone the error into the calling thread */
if (thread->state & PERL_ITHR_DIED) {
#if (PERL_VERSION < 13) || (PERL_VERSION == 13 && PERL_SUBVERSION <= 1)
PerlInterpreter *other_perl;
CLONE_PARAMS clone_params;
ithread *current_thread;
other_perl = thread->interp;
clone_params.stashes = newAV();
clone_params.flags = CLONEf_JOIN_IN;
PL_ptr_table = ptr_table_new();
current_thread = S_ithread_get(aTHX);
S_ithread_set(aTHX_ thread);
/* Ensure 'meaningful' addresses retain their meaning */
ptr_table_store(PL_ptr_table, &other_perl->Isv_undef, &PL_sv_undef);
ptr_table_store(PL_ptr_table, &other_perl->Isv_no, &PL_sv_no);
ptr_table_store(PL_ptr_table, &other_perl->Isv_yes, &PL_sv_yes);
err = sv_dup(thread->err, &clone_params);
S_ithread_set(aTHX_ current_thread);
SvREFCNT_dec(clone_params.stashes);
SvREFCNT_inc_void(err);
/* If error was an object, bless it into the correct class */
if (thread->err_class) {
sv_bless(err, gv_stashpv(thread->err_class, 1));
}
ptr_table_free(PL_ptr_table);
PL_ptr_table = NULL;
#else
PerlInterpreter *other_perl = thread->interp;
CLONE_PARAMS *clone_params = Perl_clone_params_new(other_perl, aTHX);
ithread *current_thread;
clone_params->flags |= CLONEf_JOIN_IN;
PL_ptr_table = ptr_table_new();
current_thread = S_ithread_get(aTHX);
S_ithread_set(aTHX_ thread);
/* Ensure 'meaningful' addresses retain their meaning */
ptr_table_store(PL_ptr_table, &other_perl->Isv_undef, &PL_sv_undef);
ptr_table_store(PL_ptr_table, &other_perl->Isv_no, &PL_sv_no);
ptr_table_store(PL_ptr_table, &other_perl->Isv_yes, &PL_sv_yes);
# ifdef PL_sv_zero
ptr_table_store(PL_ptr_table, &other_perl->Isv_zero, &PL_sv_zero);
# endif
err = sv_dup(thread->err, clone_params);
S_ithread_set(aTHX_ current_thread);
Perl_clone_params_del(clone_params);
SvREFCNT_inc_void(err);
/* If error was an object, bless it into the correct class */
if (thread->err_class) {
sv_bless(err, gv_stashpv(thread->err_class, 1));
}
ptr_table_free(PL_ptr_table);
PL_ptr_table = NULL;
#endif
}
MUTEX_UNLOCK(&thread->mutex);
if (! err) {
XSRETURN_UNDEF;
}
ST(0) = sv_2mortal(err);
/* XSRETURN(1); - implied */
#endif /* USE_ITHREADS */
BOOT:
{
#ifdef USE_ITHREADS
SV *my_pool_sv = *hv_fetch(PL_modglobal, MY_POOL_KEY,
sizeof(MY_POOL_KEY)-1, TRUE);
my_pool_t *my_poolp = (my_pool_t*)SvPVX(newSV(sizeof(my_pool_t)-1));
MY_CXT_INIT;
Zero(my_poolp, 1, my_pool_t);
sv_setuv(my_pool_sv, PTR2UV(my_poolp));
PL_perl_destruct_level = 2;
MUTEX_INIT(&MY_POOL.create_destruct_mutex);
MUTEX_LOCK(&MY_POOL.create_destruct_mutex);
PL_threadhook = &Perl_ithread_hook;
MY_POOL.tid_counter = 1;
# ifdef THREAD_CREATE_NEEDS_STACK
MY_POOL.default_stack_size = THREAD_CREATE_NEEDS_STACK;
# endif
/* The 'main' thread is thread 0.
* It is detached (unjoinable) and immortal.
*/
MUTEX_INIT(&MY_POOL.main_thread.mutex);
/* Head of the threads list */
MY_POOL.main_thread.next = &MY_POOL.main_thread;
MY_POOL.main_thread.prev = &MY_POOL.main_thread;
MY_POOL.main_thread.count = 1; /* Immortal */
MY_POOL.main_thread.interp = aTHX;
MY_POOL.main_thread.state = PERL_ITHR_DETACHED; /* Detached */
MY_POOL.main_thread.stack_size = MY_POOL.default_stack_size;
# ifdef WIN32
MY_POOL.main_thread.thr = GetCurrentThreadId();
# else
MY_POOL.main_thread.thr = pthread_self();
# endif
S_ithread_set(aTHX_ &MY_POOL.main_thread);
MUTEX_UNLOCK(&MY_POOL.create_destruct_mutex);
#endif /* USE_ITHREADS */
}
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