74 lines
1.6 KiB
C
74 lines
1.6 KiB
C
#include "libnazgul.h"
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#include "ids.h"
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msgQueue * msgQueueInit(msgSpaceId externId, int queueIdx) {
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int queueFd;
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msgQueue * queue;
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sem_t * semProtectFd;
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msgQueueSemId queueSemProtectId;
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sem_t * semReadableFd;
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msgQueueSemId queueSemReadableId;
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msgQueueId queueId;
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queue = NULL;
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printf("ploped init queue ?\n");
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msgQueueProtSemIdIntern(queueSemProtectId,externId,queueIdx);
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msgQueueReadSemIdIntern(queueSemReadableId,externId,queueIdx);
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// creation du semaphore de lecture
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semReadableFd = sem_open(queueSemReadableId,
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O_CREAT|O_EXCL, SEM_DEFAULT_MODE, 0);
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if(semReadableFd == SEM_FAILED) {
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NZG_ERROR("sem_open", queueSemReadableId);
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goto ERROR;
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}
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// creation du semaphore de protection
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semProtectFd = sem_open(queueSemProtectId,
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O_CREAT|O_EXCL, SEM_DEFAULT_MODE, 1);
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if(semProtectFd == SEM_FAILED) {
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NZG_ERROR("sem_open", queueSemProtectId);
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goto ERROR;
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}
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if(sem_wait(semProtectFd)==-1){
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NZG_ERROR("sem_wait",queueSemProtectId);
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goto ERROR;
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}
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if(msgQueueIdIntern(queueId, externId, queueIdx) < 0) {
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return NULL;
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}
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queueFd = shm_open(queueId, O_RDWR|O_CREAT|O_EXCL|O_TRUNC, MSGSPACE_DEFAULT_MODE);
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if(queueFd == -1) {
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fprintf(stderr, "queueInit : %s initialisation failed: %s\n", queueId, strerror(errno));
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return NULL;
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}
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if(ftruncate(queueFd, sizeof(* queue)) == -1) {
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fprintf( stderr, "Queue resizing failed: %s\n",
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strerror( errno ) );
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return NULL;
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}
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/* on remplit la structure msgQueue */
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queue->elemCounter = 0;
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strcpy(queue->headId,queue->id);
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strcpy(queue->tailId,queue->id);
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/* on ferme tout ce qu'il faut */
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sem_close(semProtectFd);
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close(queueFd);
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return queue;
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ERROR:
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return NULL;
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}
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