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zos: fix semaphore initialization

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To set an initial value to a semaphore, the semop call won't do it.
We need to use the semctl call with the SETVAL flag

PR-URL: https://github.com/libuv/libuv/pull/1473
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
This commit is contained in:
John Barboza 2017-08-11 07:28:47 -04:00 committed by Santiago Gimeno
parent ce41af28c8
commit e80921c1ae
1 changed files with 7 additions and 4 deletions
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11
src/unix/thread.c
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@ -387,16 +387,19 @@ int uv_sem_init(uv_sem_t* sem, unsigned int value) {
uv_sem_t semid;
struct sembuf buf;
int err;
union {
int val;
struct semid_ds* buf;
unsigned short* array;
} arg;
buf.sem_num = 0;
buf.sem_op = value;
buf.sem_flg = 0;
semid = semget(IPC_PRIVATE, 1, S_IRUSR | S_IWUSR);
if (semid == -1)
return -errno;
if (-1 == semop(semid, &buf, 1)) {
arg.val = value;
if (-1 == semctl(semid, 0, SETVAL, arg)) {
err = errno;
if (-1 == semctl(*sem, 0, IPC_RMID))
abort();