summaryrefslogtreecommitdiff
path: root/src/thread/pthread_mutexattr_setprotocol.c
blob: 8b80c1ce9b14c1b039de327c9870dea08a3ca846 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
#include "pthread_impl.h"
#include "syscall.h"

static volatile int check_pi_result = -1;

int pthread_mutexattr_setprotocol(pthread_mutexattr_t *a, int protocol)
{
	int r;
	switch (protocol) {
	case PTHREAD_PRIO_NONE:
		a->__attr &= ~8;
		return 0;
	case PTHREAD_PRIO_INHERIT:
		r = check_pi_result;
		if (r < 0) {
			volatile int lk = 0;
			r = -__syscall(SYS_futex, &lk, FUTEX_LOCK_PI, 0, 0);
			a_store(&check_pi_result, r);
		}
		if (r) return r;
		a->__attr |= 8;
		return 0;
	case PTHREAD_PRIO_PROTECT:
		return ENOTSUP;
	default:
		return EINVAL;
	}
}