update

wangzhengquan

2020-07-07 f42ddf22907c681d8b08eeceef160d4566dba437

 squeue/mm.c

@@ -3,7 +3,7 @@
 */
#include "mm.h"
#include "sem_util.h"

#include "logger_factory.h"

/* $begin mallocmacros */
/* single word (4) or double word (8) alignment */
@@ -279,12 +279,29 @@
 

void mm_destroy(void) {

  struct shmid_ds shmid_ds;
  //detache
  if (shmdt(shmp) == -1)
    err_exit(errno, "mm_init shmdt");
  if (shmctl(shmid, IPC_RMID, 0) == -1)
    err_exit(errno, "mm_init shmctl IPC_RMID");
  SemUtil::remove(mutex);
    err_exit(errno, "mm_destroy shmdt");

  
  if(shmctl(shmid, IPC_STAT, &shmid_ds) == -1) {
    err_exit(errno, "mm_destroy shmctl IPC_STAT");
  } else {
    //LoggerFactory::getLogger().debug("shm_nattch=%d\n", shmid_ds.shm_nattch);
    if(shmid_ds.shm_nattch == 0) {
      //remove shared memery
       if (shmctl(shmid, IPC_RMID, 0) == -1)
        err_exit(errno, "mm_destroy shmctl IPC_RMID");
       else 
         LoggerFactory::getLogger().debug("shared memory destroy\n");

       SemUtil::remove(mutex);

    }
  }
 
  
}
/*
 * extend_heap - Extend heap with free block and return its block pointer