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In the programming example, the following activities will happen:
Prerequisite: The mutex module has been configured using the make menuconfig command.
The code is as follows:
/*Mutex handler ID*/
UINT32 g_testMux;
/*Task ID*/
UINT32 g_testTaskId01;
UINT32 g_testTaskId02;
VOID Example_MutexTask1(VOID)
{
UINT32 ret;
printf("task1 try to get mutex, wait 10 ticks.\n");
/* Request a mutex.*/
ret = LOS_MuxPend(g_testMux, 10);
if (ret == LOS_OK) {
printf("task1 get mutex g_testMux.\n");
/*Release the mutex.*/
LOS_MuxPost(g_testMux);
return;
} else if (ret == LOS_ERRNO_MUX_TIMEOUT ) {
printf("task1 timeout and try to get mutex, wait forever.\n");
/* Request a mutex.*/
ret = LOS_MuxPend(g_testMux, LOS_WAIT_FOREVER);
if (ret == LOS_OK) {
printf("task1 wait forever, get mutex g_testMux.\n");
/*Release the mutex.*/
LOS_MuxPost(g_testMux);
return;
}
}
return;
}
VOID Example_MutexTask2(VOID)
{
printf("task2 try to get mutex, wait forever.\n");
/* Request a mutex.*/
(VOID)LOS_MuxPend(g_testMux, LOS_WAIT_FOREVER);
printf("task2 get mutex g_testMux and suspend 100 ticks.\n");
/*Enable the task to enter sleep mode for 100 ticks.*/
LOS_TaskDelay(100);
printf("task2 resumed and post the g_testMux\n");
/*Release the mutex.*/
LOS_MuxPost(g_testMux);
return;
}
UINT32 Example_TaskEntry(VOID)
{
UINT32 ret;
TSK_INIT_PARAM_S task1;
TSK_INIT_PARAM_S task2;
/*Create a mutex.*/
LOS_MuxCreate(&g_testMux);
/*Lock task scheduling.*/
LOS_TaskLock();
/*Create task1.*/
memset(&task1, 0, sizeof(TSK_INIT_PARAM_S));
task1.pfnTaskEntry = (TSK_ENTRY_FUNC)Example_MutexTask1;
task1.pcName = "MutexTsk1";
task1.uwStackSize = LOSCFG_BASE_CORE_TSK_DEFAULT_STACK_SIZE;
task1.usTaskPrio = 5;
ret = LOS_TaskCreate(&g_testTaskId01, &task1);
if (ret != LOS_OK) {
printf("task1 create failed.\n");
return LOS_NOK;
}
/*Create task2.*/
memset(&task2, 0, sizeof(TSK_INIT_PARAM_S));
task2.pfnTaskEntry = (TSK_ENTRY_FUNC)Example_MutexTask2;
task2.pcName = "MutexTsk2";
task2.uwStackSize = LOSCFG_BASE_CORE_TSK_DEFAULT_STACK_SIZE;
task2.usTaskPrio = 4;
ret = LOS_TaskCreate(&g_testTaskId02, &task2);
if (ret != LOS_OK) {
printf("task2 create failed.\n");
return LOS_NOK;
}
/*Unlock task scheduling.*/
LOS_TaskUnlock();
/*Enable the task to enter sleep mode for 300 ticks.*/
LOS_TaskDelay(300);
/*Delete the mutex.*/
LOS_MuxDelete(g_testMux);
/*Delete task1.*/
ret = LOS_TaskDelete(g_testTaskId01);
if (ret != LOS_OK) {
printf("task1 delete failed .\n");
return LOS_NOK;
}
/*Delete task2.*/
ret = LOS_TaskDelete(g_testTaskId02);
if (ret != LOS_OK) {
printf("task2 delete failed .\n");
return LOS_NOK;
}
return LOS_OK;
}
The verification result is as follows:
task2 try to get mutex, wait forever.
task2 get mutex g_testMux and suspend 100 ticks.
task1 try to get mutex, wait 10 ticks.
task1 timeout and try to get mutex, wait forever.
task2 resumed and post the g_testMux
task1 wait forever,get mutex g_testMux.
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