semb.c

在TORNADO下写的基于VXWORKS的多信号量通信的源代码

#include "vxWorks.h"
#include "semLib.h"

SEM_ID semB_id;

/*
	SEM_Q_FIFO (0x0)
	SEM_Q_PRIORITY (0x1)
	SEM_DELETE_SAFE (0x4) 
	SEM_INVERSION_SAFE (0x8)
	SEM_EVENTSEND_ERR_NOTIFY (0x10)
*/

void semBTask(SEM_ID semId)
{
	FOREVER
	{
		printf("[%s] task is waiting for a BINARY semaphore... -- loop\n",taskName(0));
		if(semTake(semId,WAIT_FOREVER)==ERROR)
        {
            printErr("semTake failed\n");
        }
        else
		{
			printf("[%s] task take a semaphore.\n",taskName(0));
			printf(" I am doing something .....!!! \n\n");
			taskDelay(300);
		}
	}
}

void testB()
{
	semB_id = semBCreate(SEM_Q_PRIORITY, SEM_EMPTY);

	printf("Semphore created!\n");
	printf("semB_id = 0x%8x \n",semB_id);

	taskSpawn("semBTask",100,0,1000,semBTask,semB_id,2,3,4,5,6,7,8,9,0);

}

void giveB()
{
	semGive(semB_id);
}