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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 {
pthread_mutex_t mu;
pthread_cond_t cv;
bool state;
};
void event_init(event_t* ev)
{
// Akaros crashes on NULL attr.
pthread_mutexattr_t attr;
pthread_mutexattr_init(&attr);
if (pthread_mutex_init(&ev->mu, &attr))
fail("pthread_mutex_init failed");
pthread_mutexattr_destroy(&attr);
pthread_condattr_t cvattr;
pthread_condattr_init(&cvattr);
if (pthread_cond_init(&ev->cv, &cvattr))
fail("pthread_cond_init failed");
pthread_condattr_destroy(&cvattr);
ev->state = false;
}
void event_reset(event_t* ev)
{
ev->state = false;
}
void event_set(event_t* ev)
{
pthread_mutex_lock(&ev->mu);
if (ev->state)
fail("event already set");
ev->state = true;
pthread_mutex_unlock(&ev->mu);
pthread_cond_broadcast(&ev->cv);
}
void event_wait(event_t* ev)
{
pthread_mutex_lock(&ev->mu);
while (!ev->state)
pthread_cond_wait(&ev->cv, &ev->mu);
pthread_mutex_unlock(&ev->mu);
}
bool event_isset(event_t* ev)
{
pthread_mutex_lock(&ev->mu);
bool res = ev->state;
pthread_mutex_unlock(&ev->mu);
return res;
}
bool event_timedwait(event_t* ev, uint64_t timeout_ms)
{
pthread_mutex_lock(&ev->mu);
uint64_t start = current_time_ms();
for (;;) {
if (ev->state)
break;
uint64_t now = current_time_ms();
if (now - start > timeout_ms)
break;
timespec ts;
ts.tv_sec = 0;
ts.tv_nsec = (timeout_ms - (now - start)) * 1000 * 1000;
pthread_cond_timedwait(&ev->cv, &ev->mu, &ts);
}
bool res = ev->state;
pthread_mutex_unlock(&ev->mu);
return res;
}
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