--- APC-3.1.9/apc_sem.c_orig Sat May 14 15:14:56 2011

+++ APC-3.1.9/apc_sem.c Tue Dec 13 16:01:59 2011

@@ -76,12 +76,16 @@

union semun arg;

key_t key = IPC_PRIVATE;

- if ((semid = semget(key, 1, IPC_CREAT | IPC_EXCL | perms)) >= 0) {

+ if ((semid = semget(key, 2, IPC_CREAT | IPC_EXCL | perms)) >= 0) {

/* sempahore created for the first time, initialize now */

arg.val = initval;

if (semctl(semid, 0, SETVAL, arg) < 0) {

apc_error("apc_sem_create: semctl(%d,...) failed:" TSRMLS_CC, semid);

}

+ arg.val = getpid();

+ if (semctl(semid, 1, SETVAL, arg) < 0) {

+ apc_error("apc_sem_create: semctl(%d,...) failed:", TSRMLS_CC, semid);

+ }

}

else if (errno == EEXIST) {

/* sempahore already exists, don't initialize */

@@ -101,7 +105,10 @@

{

/* we expect this call to fail often, so we do not check */

union semun arg;

- semctl(semid, 0, IPC_RMID, arg);

+ int semPid = semctl(semid, 1, GETVAL, 0);

+ if (semPid == getpid()) {

+ semctl(semid, 0, IPC_RMID, arg);

+ }

}

void apc_sem_lock(int semid TSRMLS_DC)