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//
// Copyright 2017 Garrett D'Amore <garrett@damore.org>
//
// This software is supplied under the terms of the MIT License, a
// copy of which should be located in the distribution where this
// file was obtained (LICENSE.txt). A copy of the license may also be
// found online at https://opensource.org/licenses/MIT.
//
// POSIX threads.
#include "core/nng_impl.h"
#ifdef PLATFORM_WINDOWS
int
nni_plat_mtx_init(nni_plat_mtx *mtx)
{
InitializeCritialSection(&mtx->cs);
mtx->owner = 0;
return (0);
}
void
nni_plat_mtx_fini(nni_plat_mtx *mtx)
{
if (mtx->owner != 0) {
nni_panic("cannot delete critical section: mutex owned!")
}
DeleteCriticalSection(&mtx->cs);
}
void
nni_plat_mtx_lock(nni_plat_mtx *mtx)
{
EnterCriticalSection(&mtx->cs);
if (mtx->owner != 0) {
nni_panic("recursive mutex entry!");
}
mtx->owner = GetCurrentThreadId();
}
void
nni_plat_mtx_unlock(nni_plat_mtx *mtx)
{
if (mtx->owner != GetCurrentThreadId()) {
nni_panic("cannot unlock mutex: not owner!");
}
self->owner = 0;
LeaveCriticalSection(&mtx->cs);
}
int
nni_plat_mtx_trylock(nni_plat_mtx *mtx)
{
BOOL ok;
ok = TryEnterCriticalSection(&mtx->cs);
if (!ok) {
return (NNG_EBUSY);
}
if (mtx->owner != 0) {
nni_panic("recursive trymutex entry?!?")
}
mtx->owner = GetCurrentThreadId();
return (0);
}
int
nni_plat_cv_init(nni_plat_cv *cv, nni_plat_mtx *mtx)
{
InitializeConditionVariable(&cv->cv);
cv->cs = &mtx->cs;
return (0);
}
void
nni_plat_cv_wake(nni_plat_cv *cv)
{
int rv;
if ((rv = pthread_cond_broadcast(&cv->cv)) != 0) {
nni_panic("pthread_cond_broadcast: %s", strerror(rv));
}
}
void
nni_plat_cv_wait(nni_plat_cv *cv)
{
(void) SleepConditionVariable(&cv->cv, &cv->cs, INFINITE);
}
int
nni_plat_cv_until(nni_plat_cv *cv, nni_time until)
{
nni_time now;
DWORD msec;
BOOL ok;
now = nni_plat_clock();
if (now > until) {
msec = 0;
} else {
// times are in usec, but win32 wants millis
msec = (until - now)/1000;
}
ok = SleepConditionVariable(&cv->cv, &cv->cs, msec);
return (ok ? 0 : NNG_ETIMEDOUT);
}
void
nni_plat_cv_fini(nni_plat_cv *cv)
{
}
static unsigned int __stdcall
nni_plat_thread_main(void *arg)
{
nni_plat_thr *thr = arg;
thr->func(thr->arg);
return (0);
}
int
nni_plat_thr_init(nni_plat_thr *thr, void (*fn)(void *), void *arg)
{
thr->func = fn;
thr->arg = arg;
thr->handle = (HANDLE) _beginthreadex(NULL, 0,
nni_plat_thr_main, thr, 0, NULL);
if (thr->handle == NULL) {
return (NNG_ENOMEM); // Best guess...
}
return (0);
}
void
nni_plat_thr_fini(nni_plat_thr *thr)
{
if (WaitForSingleObject(thr->handle, INFINITE) == WAIT_FAILED) {
nni_panic("waiting for thread failed!");
}
if (CloseHandle(thr->handle) == 0) {
nni_panic("close handle for thread failed!");
}
}
int
nni_plat_init(int (*helper)(void))
{
int rv;
LONG old;
static LONG initing = 0;
static LONG inited = 0;
if (inited) {
return (0); // fast path
}
// This logic gets us to initialize the platform just once.
// If two threads enter here together, only one will get to run,
// and the other will be put to sleep briefly so that the first
// can complete. This is a poor man's singleton initializer, since
// we can't statically initialize critical sections.
while ((old = InterlockedTestExchange(&initing, 0, 1)) != 0) {
Sleep(1);
}
if (!inited) {
helper();
inited = 1;
}
InterlockExchange(&initing, 0);
return (rv);
}
void
nni_plat_fini(void)
{
}
#endif
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