2004-02-20 19:36:06 +00:00
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#include "libnazgul.h"
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/* TODO: remplacer le bool de msgPoolData par un identifiant
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de semaphore. Le semaphore contient poolNb valeurs (et indique
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donc le nombre de ressources disponnibles).
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*/
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#define ANYPOOL -1
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#define SPECIFICPOOL 0
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2004-02-20 21:47:08 +00:00
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void * msgAllocate(msgSpace *space,
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2004-02-20 19:36:06 +00:00
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int pool,
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int taille,
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int option=0
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){
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void * resultAddr;
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2004-02-20 21:47:08 +00:00
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int i, mSPoolDataTabFd;
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2004-02-20 19:36:06 +00:00
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msgPoolDataId resultPoolID;
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2004-02-20 21:47:08 +00:00
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sem_t * sem;
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mSPoolDataTabFd=shm_open(space->msgPoolDataTabID,O_RDWR,MSGSPACE_DEFAULT_MODE);
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2004-02-20 19:36:06 +00:00
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if (mSFd == -1 ) {
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fprintf( stderr, "msgSpace %s creation failed: %s\n",
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(char*)nzgId,
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strerror( errno ) );
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return NULL;
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}
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msgPoolData * mSPoolDataTab;
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mSPoolDataTab = mmap( 0, (space->poolNb) * sizeof( msgPoolData ),
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PROT_READ | PROT_WRITE,
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MAP_SHARED, mSPoolDataTabFd, 0 );
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if( mSPoolDataTab == 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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bool gotSem=false;
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int gotIdx=-1;
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if (pool == ANYPOOL){
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/* se debrouiller pour choisir la 1ere pool
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de taille plus grande libre si possible */
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for(i=0; i<(space->poolNb); i++) {
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if(msgPoolDataTab[i].bufferSize >= taille) {
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/* TODO: choisir le numero du semaphore
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en fonction du nombre de lock poses / nombre de buffer */
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2004-02-20 21:47:08 +00:00
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2004-02-20 19:36:06 +00:00
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gotIdx=i;
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if(sem_trywait(sem)) {
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gotSem=true;
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break;
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}
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}
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}
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resultPoolID=mSPoolDataTab[i]->id;
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} else {
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resultPoolID=mSPoolDataTab[pool]->id;
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}
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2004-02-20 21:47:08 +00:00
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2004-02-20 19:36:06 +00:00
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/* TODO: trouver un buffer libre, ou dormir */
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/* mapper le buffer dans l'esp addr du proc */
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/* TODO: unmapper le msgPoolDataTab */
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return resultAddr;
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}
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