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// Copyright 2017 syzkaller project authors. All rights reserved.
// Use of this source code is governed by Apache 2 LICENSE that can be found in the LICENSE file.
#include <pthread.h>
typedef pthread_t osthread_t;
void thread_start(osthread_t* t, void* (*fn)(void*), void* arg)
{
pthread_attr_t attr;
pthread_attr_init(&attr);
pthread_attr_setstacksize(&attr, 128 << 10);
if (pthread_create(t, &attr, fn, arg))
exitf("pthread_create failed");
pthread_attr_destroy(&attr);
}
struct event_t {
int state;
};
void event_init(event_t* ev)
{
ev->state = 0;
}
void event_reset(event_t* ev)
{
ev->state = 0;
}
void event_set(event_t* ev)
{
if (ev->state)
fail("event already set");
__atomic_store_n(&ev->state, 1, __ATOMIC_RELEASE);
syscall(SYS_futex, &ev->state, FUTEX_WAKE);
}
void event_wait(event_t* ev)
{
while (!__atomic_load_n(&ev->state, __ATOMIC_ACQUIRE))
syscall(SYS_futex, &ev->state, FUTEX_WAIT, 0, 0);
}
bool event_isset(event_t* ev)
{
return __atomic_load_n(&ev->state, __ATOMIC_ACQUIRE);
}
bool event_timedwait(event_t* ev, uint64_t timeout_ms)
{
uint64_t start = current_time_ms();
uint64_t now = start;
for (;;) {
timespec ts = {};
ts.tv_sec = 0;
ts.tv_nsec = (timeout_ms - (now - start)) * 1000 * 1000;
syscall(SYS_futex, &ev->state, FUTEX_WAIT, 0, &ts);
if (__atomic_load_n(&ev->state, __ATOMIC_RELAXED))
return true;
now = current_time_ms();
if (now - start > timeout_ms)
return false;
}
}
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