shareSem.rar

/* semTask1.c - shared semaphore example */ /* Copyright 1984-1997 Wind River Systems, Inc. */ /* modification history -------------------- 01b,06nov97,mm added copyright. 01b,17seot97,ram need to add INCLUDE_SM_OBJ in configAll.h tested OK 01,27jan94,jl cleanup of code in programmers manual */ #include <vxWorks.h> #include "semLib.h" #include "semSmLib.h" #include "smNameLib.h" #include "stdio.h" #include "taskLib.h" #include "semExample.h" #include "sysLib.h" /************************************************************************ * * semTask1 - shared semaphore user * */ STATUS semTask1 (void) { SEM_ID semSmId; /* create shared semaphore */ if ((semSmId = semBSmCreate (SEM_Q_FIFO, SEM_FULL)) == NULL) return (ERROR); /* add object to name database */ if (smNameAdd (SEM_NAME, semSmId, T_SM_SEM_B) == ERROR) return (ERROR); /* grab shared semaphore and hold it for awhile */ semTake (semSmId, WAIT_FOREVER); /* normally do something useful */ printf ("Task1 has the shared semaphore\n"); taskDelay (sysClkRateGet () * 5); printf ("Task1 is releasing the shared semaphore\n"); /* release shared semaphore */ semGive (semSmId); return (OK); }