l3.libnazgul/src/free.c

#include "libnazgul.h"

int msgFree(msgSpace * space, void * addr){
  printf("[ FREE 0x%08x ]\n",(int)addr);

  int poolIndex;
  int bufferIndex;
  msgPoolData * poolDataTabAddr;
  sem_t * ressourceSemFd;
 msgPoolDataTabSemId ressourceSemId;
   /* on acquiert le droit de modifier les infos sur la ressource */
  /* on protege le tableau des associations */
  if (msgPoolDataTabLock(space) <0){
	NZG_ERROR("msgPoolDataTabLock",space->poolDataTabSemId);
	goto ERROR;
  };

  /* verifier le premier arg du shm_open */

  poolDataTabAddr = msgPoolDataTabOpen(space);

  // TODO: verouiller semaphore DataInfo ??
  int err;

  poolIndex=-1; bufferIndex=-1;
  err=msgBufferGetProcAttach(
	  poolDataTabAddr,
	  space->poolNb,
	  &poolIndex,
	  &bufferIndex,
	  addr
	  );

  printf("Found : %d\n",err);
  printf("Freing pool: %d, buffer: %d\n",poolIndex,bufferIndex);
  msgBufferDetachProc(poolDataTabAddr,poolIndex,bufferIndex,addr);

  /* unmapper le buffer */
  void * realAddr=addr;
  int bufferSize=poolDataTabAddr[poolIndex].bufferSize;
  int bufferNb=poolDataTabAddr[poolIndex].bufferNb;
  realAddr=realAddr-poolIndex*bufferSize;
  munmap(realAddr,bufferSize*bufferNb);
 
  msgPoolDataTabClose(space,poolDataTabAddr);

  // deverouiller semaphore DataInfo
msgPoolDataTabUnlock(space);
  
  // deverouiller semaphore ressource.
  msgPoolSemIdIntern(ressourceSemId,space->externId,poolIndex);
  ressourceSemFd = sem_open(ressourceSemId,O_CREAT,SEM_DEFAULT_MODE,0);
  if (ressourceSemFd == SEM_FAILED){ 
	NZG_ERROR("sem_open",ressourceSemId);
	goto ERROR;
  }
  sem_post(ressourceSemFd);
  sem_close(ressourceSemFd);
  return 0;
ERROR:
  return -1;
}