Rich Felker
69a1b39019
this makes the code slightly smaller and eliminates these functions from relevance to possible future changes to multithreaded fork. the barrier of a_store isn't technically needed here, but a_store is used anyway for internal consistency of the memory model.
29 lines
560 B
C
29 lines
560 B
C
#include "pthread_impl.h"
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#include "syscall.h"
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static volatile int check_pi_result = -1;
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int pthread_mutexattr_setprotocol(pthread_mutexattr_t *a, int protocol)
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{
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int r;
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switch (protocol) {
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case PTHREAD_PRIO_NONE:
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a->__attr &= ~8;
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return 0;
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case PTHREAD_PRIO_INHERIT:
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r = check_pi_result;
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if (r < 0) {
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volatile int lk = 0;
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r = -__syscall(SYS_futex, &lk, FUTEX_LOCK_PI, 0, 0);
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a_store(&check_pi_result, r);
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}
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if (r) return r;
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a->__attr |= 8;
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return 0;
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case PTHREAD_PRIO_PROTECT:
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return ENOTSUP;
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default:
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return EINVAL;
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}
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}
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