34 lines
655 B
C
34 lines
655 B
C
#include "libnazgul.h"
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#include "ids.h"
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int msgQueueReadTryLock(msgSpaceId externId,int queueIdx){
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sem_t * queueSemFd;
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msgQueueSemId queueSemId;
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msgQueueReadSemIdIntern(queueSemId,externId,queueIdx);
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queueSemFd=sem_open(queueSemId,O_CREAT,SEM_DEFAULT_MODE,1);
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if(queueSemFd==SEM_FAILED){
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NZG_ERROR("sem_open",queueSemId);
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goto ERROR;
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}
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if(sem_trywait(queueSemFd)==-1){
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NZG_ERROR("sem_wait",queueSemId);
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goto ERROR;
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}
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printf("Locking %s\n",queueSemId);
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int semval=0;
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sem_getvalue(queueSemFd,&semval);
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printf("(AfterValue:%d)\n",semval);
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sem_close(queueSemFd);
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sem_close(queueSemFd);
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return 0;
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ERROR:
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return -1;
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}
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