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kernel_liteos_a/kernel/base/ipc/los_sem.c

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/*
* Copyright (c) 2013-2019 Huawei Technologies Co., Ltd. All rights reserved.
* Copyright (c) 2020-2021 Huawei Device Co., Ltd. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this list of
* conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice, this list
* of conditions and the following disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* 3. Neither the name of the copyright holder nor the names of its contributors may be used
* to endorse or promote products derived from this software without specific prior written
* permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "los_sem_pri.h"
#include "los_sem_debug_pri.h"
#include "los_err_pri.h"
#include "los_task_pri.h"
#include "los_exc.h"
#include "los_sched_pri.h"
#include "los_spinlock.h"
#include "los_mp.h"
#include "los_percpu_pri.h"
#if (LOSCFG_BASE_IPC_SEM == YES)
#if (LOSCFG_BASE_IPC_SEM_LIMIT <= 0)
#error "sem maxnum cannot be zero"
#endif /* LOSCFG_BASE_IPC_SEM_LIMIT <= 0 */
LITE_OS_SEC_DATA_INIT STATIC LOS_DL_LIST g_unusedSemList;
LITE_OS_SEC_BSS LosSemCB *g_allSem = NULL;
/*
* Description : Initialize the semaphore doubly linked list
* Return : LOS_OK on success, or error code on failure
*/
LITE_OS_SEC_TEXT_INIT UINT32 OsSemInit(VOID)
{
LosSemCB *semNode = NULL;
UINT32 index;
LOS_ListInit(&g_unusedSemList);
/* system resident memory, don't free */
g_allSem = (LosSemCB *)LOS_MemAlloc(m_aucSysMem0, (LOSCFG_BASE_IPC_SEM_LIMIT * sizeof(LosSemCB)));
if (g_allSem == NULL) {
return LOS_ERRNO_SEM_NO_MEMORY;
}
for (index = 0; index < LOSCFG_BASE_IPC_SEM_LIMIT; index++) {
semNode = ((LosSemCB *)g_allSem) + index;
semNode->semID = SET_SEM_ID(0, index);
semNode->semStat = OS_SEM_UNUSED;
LOS_ListTailInsert(&g_unusedSemList, &semNode->semList);
}
if (OsSemDbgInitHook() != LOS_OK) {
return LOS_ERRNO_SEM_NO_MEMORY;
}
return LOS_OK;
}
/*
* Description : Create a semaphore,
* Input : count --- semaphore count,
* maxCount --- Max number of available semaphores,
* semHandle --- Index of semaphore,
* Return : LOS_OK on success ,or error code on failure
*/
LITE_OS_SEC_TEXT_INIT UINT32 OsSemCreate(UINT16 count, UINT16 maxCount, UINT32 *semHandle)
{
UINT32 intSave;
LosSemCB *semCreated = NULL;
LOS_DL_LIST *unusedSem = NULL;
UINT32 errNo;
UINT32 errLine;
if (semHandle == NULL) {
return LOS_ERRNO_SEM_PTR_NULL;
}
if (count > maxCount) {
OS_GOTO_ERR_HANDLER(LOS_ERRNO_SEM_OVERFLOW);
}
SCHEDULER_LOCK(intSave);
if (LOS_ListEmpty(&g_unusedSemList)) {
SCHEDULER_UNLOCK(intSave);
OsSemInfoGetFullDataHook();
OS_GOTO_ERR_HANDLER(LOS_ERRNO_SEM_ALL_BUSY);
}
unusedSem = LOS_DL_LIST_FIRST(&g_unusedSemList);
LOS_ListDelete(unusedSem);
SCHEDULER_UNLOCK(intSave);
semCreated = GET_SEM_LIST(unusedSem);
semCreated->semCount = count;
semCreated->semStat = OS_SEM_USED;
semCreated->maxSemCount = maxCount;
LOS_ListInit(&semCreated->semList);
*semHandle = semCreated->semID;
OsSemDbgUpdateHook(semCreated->semID, OsCurrTaskGet()->taskEntry, count);
return LOS_OK;
ERR_HANDLER:
OS_RETURN_ERROR_P2(errLine, errNo);
}
LITE_OS_SEC_TEXT_INIT UINT32 LOS_SemCreate(UINT16 count, UINT32 *semHandle)
{
return OsSemCreate(count, OS_SEM_COUNT_MAX, semHandle);
}
LITE_OS_SEC_TEXT_INIT UINT32 LOS_BinarySemCreate(UINT16 count, UINT32 *semHandle)
{
return OsSemCreate(count, OS_SEM_BINARY_COUNT_MAX, semHandle);
}
LITE_OS_SEC_TEXT_INIT UINT32 LOS_SemDelete(UINT32 semHandle)
{
UINT32 intSave;
LosSemCB *semDeleted = NULL;
UINT32 errNo;
UINT32 errLine;
if (GET_SEM_INDEX(semHandle) >= (UINT32)LOSCFG_BASE_IPC_SEM_LIMIT) {
OS_GOTO_ERR_HANDLER(LOS_ERRNO_SEM_INVALID);
}
semDeleted = GET_SEM(semHandle);
SCHEDULER_LOCK(intSave);
if ((semDeleted->semStat == OS_SEM_UNUSED) || (semDeleted->semID != semHandle)) {
SCHEDULER_UNLOCK(intSave);
OS_GOTO_ERR_HANDLER(LOS_ERRNO_SEM_INVALID);
}
if (!LOS_ListEmpty(&semDeleted->semList)) {
SCHEDULER_UNLOCK(intSave);
OS_GOTO_ERR_HANDLER(LOS_ERRNO_SEM_PENDED);
}
LOS_ListTailInsert(&g_unusedSemList, &semDeleted->semList);
semDeleted->semStat = OS_SEM_UNUSED;
semDeleted->semID = SET_SEM_ID(GET_SEM_COUNT(semDeleted->semID) + 1, GET_SEM_INDEX(semDeleted->semID));
OsSemDbgUpdateHook(semDeleted->semID, NULL, 0);
SCHEDULER_UNLOCK(intSave);
return LOS_OK;
ERR_HANDLER:
OS_RETURN_ERROR_P2(errLine, errNo);
}
LITE_OS_SEC_TEXT UINT32 LOS_SemPend(UINT32 semHandle, UINT32 timeout)
{
UINT32 intSave;
LosSemCB *semPended = GET_SEM(semHandle);
UINT32 retErr = LOS_OK;
LosTaskCB *runTask = NULL;
if (GET_SEM_INDEX(semHandle) >= (UINT32)LOSCFG_BASE_IPC_SEM_LIMIT) {
OS_RETURN_ERROR(LOS_ERRNO_SEM_INVALID);
}
if (OS_INT_ACTIVE) {
PRINT_ERR("!!!LOS_ERRNO_SEM_PEND_INTERR!!!\n");
OsBackTrace();
return LOS_ERRNO_SEM_PEND_INTERR;
}
runTask = OsCurrTaskGet();
if (runTask->taskStatus & OS_TASK_FLAG_SYSTEM_TASK) {
OsBackTrace();
return LOS_ERRNO_SEM_PEND_IN_SYSTEM_TASK;
}
SCHEDULER_LOCK(intSave);
if ((semPended->semStat == OS_SEM_UNUSED) || (semPended->semID != semHandle)) {
retErr = LOS_ERRNO_SEM_INVALID;
goto OUT;
}
/* Update the operate time, no matter the actual Pend success or not */
OsSemDbgTimeUpdateHook(semHandle);
if (semPended->semCount > 0) {
semPended->semCount--;
goto OUT;
} else if (!timeout) {
retErr = LOS_ERRNO_SEM_UNAVAILABLE;
goto OUT;
}
if (!OsPreemptableInSched()) {
PRINT_ERR("!!!LOS_ERRNO_SEM_PEND_IN_LOCK!!!\n");
OsBackTrace();
retErr = LOS_ERRNO_SEM_PEND_IN_LOCK;
goto OUT;
}
OsTaskWaitSetPendMask(OS_TASK_WAIT_SEM, semPended->semID, timeout);
retErr = OsSchedTaskWait(&semPended->semList, timeout, TRUE);
if (retErr == LOS_ERRNO_TSK_TIMEOUT) {
retErr = LOS_ERRNO_SEM_TIMEOUT;
}
OUT:
SCHEDULER_UNLOCK(intSave);
return retErr;
}
LITE_OS_SEC_TEXT UINT32 OsSemPostUnsafe(UINT32 semHandle, BOOL *needSched)
{
LosSemCB *semPosted = NULL;
LosTaskCB *resumedTask = NULL;
semPosted = GET_SEM(semHandle);
if ((semPosted->semID != semHandle) || (semPosted->semStat == OS_SEM_UNUSED)) {
return LOS_ERRNO_SEM_INVALID;
}
/* Update the operate time, no matter the actual Post success or not */
OsSemDbgTimeUpdateHook(semHandle);
if (semPosted->semCount == OS_SEM_COUNT_MAX) {
return LOS_ERRNO_SEM_OVERFLOW;
}
if (!LOS_ListEmpty(&semPosted->semList)) {
resumedTask = OS_TCB_FROM_PENDLIST(LOS_DL_LIST_FIRST(&(semPosted->semList)));
OsTaskWakeClearPendMask(resumedTask);
OsSchedTaskWake(resumedTask);
if (needSched != NULL) {
*needSched = TRUE;
}
} else {
semPosted->semCount++;
}
return LOS_OK;
}
LITE_OS_SEC_TEXT UINT32 LOS_SemPost(UINT32 semHandle)
{
UINT32 intSave;
UINT32 ret;
BOOL needSched = FALSE;
if (GET_SEM_INDEX(semHandle) >= LOSCFG_BASE_IPC_SEM_LIMIT) {
return LOS_ERRNO_SEM_INVALID;
}
SCHEDULER_LOCK(intSave);
ret = OsSemPostUnsafe(semHandle, &needSched);
SCHEDULER_UNLOCK(intSave);
if (needSched) {
LOS_MpSchedule(OS_MP_CPU_ALL);
LOS_Schedule();
}
return ret;
}
#endif /* (LOSCFG_BASE_IPC_SEM == YES) */
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