diff --git a/src/nzg_allocate.c b/src/nzg_allocate.c
index 040c95c..6603578 100644
--- a/src/nzg_allocate.c
+++ b/src/nzg_allocate.c
@@ -38,7 +38,7 @@ void * msgAllocate(msgSpace *space,
 
 
  
-  /* TODO: verifier le premier arg du shm_open */
+  /* verifier le premier arg du shm_open */
   mSPoolDataTabFd=shm_open(space->poolDataTabId,
 	  O_RDWR,
 	  MSGSPACE_DEFAULT_MODE);
diff --git a/src/nzg_bufferDetachProc.c b/src/nzg_bufferDetachProc.c
index 5b1572e..8ec4949 100644
--- a/src/nzg_bufferDetachProc.c
+++ b/src/nzg_bufferDetachProc.c
@@ -1,7 +1,7 @@
 #include "libnazgul.h"
 
 int msgBufferDetachProc(
-		msgPoolData * poolDataTabAddr,
+	msgPoolData * poolDataTabAddr,
 	int poolIndex,
 	int bufferIndex,
 	void * addr
diff --git a/src/nzg_free.c b/src/nzg_free.c
index b99a2f6..ecd9b9a 100644
--- a/src/nzg_free.c
+++ b/src/nzg_free.c
@@ -1,6 +1,86 @@
 #include "libnazgul.h"
 
 int msgFree(msgSpace * space, void * addr){
+
+  int poolIndex;
+  int bufferIndex;
+  int poolDataTabFd;
+  msgPoolData * poolDataTabAddr;
+sem_t * poolDataTabSemFd;
+ msgPoolDataTabSemId ressourceSemId;
+  sem_t * ressourceSemFd;
+  /* on acquiert le droit de modifier les infos sur la ressource */
+  /* on protege le tableau des associations */
+  poolDataTabSemFd=sem_open(space->poolDataTabSemId,
+	  O_CREAT,SEM_DEFAULT_MODE,1);
+  if (poolDataTabSemFd == SEM_FAILED){ 
+	NZG_ERROR("sem_open : ouverture de la ressource",
+		space->poolDataTabSemId);
+	return -1; 
+  }
+  sem_wait(poolDataTabSemFd);
+
+
+
+  /* verifier le premier arg du shm_open */
+
+  poolDataTabFd=shm_open(space->poolDataTabId,
+	  O_RDWR,
+	  MSGSPACE_DEFAULT_MODE);
+  if (poolDataTabFd == -1 ) {
+	fprintf( stderr, "Allocate %s failed: %s\n",
+		(char*)space->poolDataTabId,
+		strerror( errno ) );
+	return -1;
+  }
+
+
+  poolDataTabAddr = mmap( 0, (space->poolNb) * sizeof( msgPoolData ),
+	  PROT_READ | PROT_WRITE,
+	  MAP_SHARED, poolDataTabFd, 0 );
+
+  if( poolDataTabAddr == MAP_FAILED) {
+	fprintf( stderr, "mmap failed: %s\n",
+		strerror( errno ) );
+	return -1;
+  }
+
+
+  // TODO: verouiller semaphore DataInfo
+  int err;
+
+  err=msgBufferGetProcAttach(
+	  poolDataTabAddr,
+	  space->poolNb,
+	  &poolIndex,
+	  &bufferIndex,
+	  addr
+	  );
+
+  msgBufferDetachProc(poolDataTabAddr,poolIndex,bufferIndex,addr);
+
+  /* unmapper le msgPoolDataTab */
+  munmap(poolDataTabAddr,(space->poolNb) * sizeof( msgPoolData ));
+
+  close(poolDataTabFd);
+
+  // deverouiller semaphore DataInfo
+ sem_post(poolDataTabSemFd);
+  sem_close(poolDataTabSemFd);
+  
+  // deverouiller semaphore ressource.
+  msgPoolSemIdIntern(ressourceSemId,space->id,poolIndex);
+  ressourceSemFd = sem_open(ressourceSemId,O_CREAT,SEM_DEFAULT_MODE,0);
+  if (ressourceSemFd == SEM_FAILED){ 
+	NZG_ERROR("sem_open",ressourceSemId);
+	return -1; 
+  }
+  sem_post(ressourceSemFd);
+  sem_close(ressourceSemFd);
+
+  //sem_open ressource
+  //sem_post
+  //sem_close
   return -1;
 }
 
diff --git a/src/nzg_proto.h b/src/nzg_proto.h
index f0ddab3..b4f40c3 100644
--- a/src/nzg_proto.h
+++ b/src/nzg_proto.h
@@ -40,5 +40,11 @@ int msgSpaceDelete(msgSpaceId externId);
 /* nzg_spaceOpen.c */
 msgSpace *msgSpaceOpen(msgSpaceId externId);
 /* nzg_state.c */
-
+int msgBufferGetProcAttach(
+	msgPoolData * poolDataTabAddr,
+	int poolNb,
+	int * poolIndex,
+	int * bufferIndex,
+	void * addr
+	);
 #endif