88 lines
2.1 KiB
C
88 lines
2.1 KiB
C
# include "libnazgul.h"
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/* pid[]
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liste process demandeurs */
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int msgPoolCreate(
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msgSpacePoolId poolId,
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int buffNb,
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int buffSize
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) {
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int poolFd;
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static int poolNb;
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msgSpacePoolId id;
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if (msgSpacePoolId2nzgPoolId(id,poolId,poolNb) == -1){
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fprintf( stderr, "msgPoolId creation failed for id %s\n",
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(char*)poolId );
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return -1;
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}
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poolFd=shm_open(id,O_RDWR|O_CREAT|O_EXCL|O_TRUNC,MSGSPACE_DEFAULT_MODE);
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if (poolFd == -1 ) {
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fprintf( stderr, "msgPool creation failed: %s\n",
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strerror( errno ) );
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return -1;
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}
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// on met le pool a la taille voulue pour qu'il
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// puisse contenir les buffs
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if (ftruncate(poolFd, (buffSize*buffNb)) == -1){
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fprintf( stderr, "msgPool resizing failed: %s\n",
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strerror( errno ) );
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return -1;
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}
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close(poolFd);
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return 0;
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}
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int msgSpacePoolId2nzgPoolId(msgSpacePoolId dest,msgSpacePoolId src, int num){
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if (strlen(src)>MSGSPACE_ID_LEN){
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return -1;
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}
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#ifdef _NZG_REALFILEID
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sprintf(dest,"/tmp/nzgSpacePool%s%d",(char *)src,num);
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#else
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sprintf(dest,"/nzgSpacePool%s%d",(char *)src,num);
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#endif
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return 0;
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}
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//TODO: msgPoolAllocate
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// //donne l'adr en mappant in the memory
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//poolAddr = mmap(NULL, sizeof(*msgPool), PROT_NONE, MAP_SHARED, poolFd, 0);
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msgPool * msgPoolAllocate(int poolIdx, msgSpace *msg) {
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msgPool * poolAddr;
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int dataId;
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// TODO:récupérer l'id du poolData dans le msgSpace
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// détacher le morceau de mémoire du processus
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// TODO:récupérer le poolData qui correspond à notre poolIdx.
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// attacher la zone mémoire correspondant à l'Id
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// utiliser des sémaphores pour vérouiller les acces en modif
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// sur la poolData de notre
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//msgSpacePoolData spoolData;
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//dataId = msg->poolDataId;
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//spoolData[dataId];
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//donne l'adr en mappant in the memory
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poolAddr = mmap(NULL, sizeof(*msgPool), PROT_NONE, MAP_SHARED, poolFd, 0);
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if(poolAddr == MAP_FAILED) {
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fprintf( stderr, "mmap failed: %s\n",
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strerror( errno ) );
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return NULL;
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}
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// on renvoie le pointeur sur le bon pool
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return poolAddr;
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}
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