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authorJosé Fonseca <jfonseca@vmware.com>2013-03-12 10:37:46 +0000
committerJosé Fonseca <jfonseca@vmware.com>2014-01-23 12:55:55 +0000
commitecaa81bd9648131e01f9ad4fd9d185370df8e872 (patch)
tree9c71722d8a20faf648c52775cd80fabf8c4b40f9 /include/c11
parent349f0a94aeaded3125d5c7f31ae2092f1b4a5727 (diff)
c11: Import threads.h emulation library.
Implementation is based of https://gist.github.com/2223710 with the following modifications: - inline implementatation - retain XP compatability - add temporary hack for static mutex initializers (as they are not part of the stack but still widely used internally) - make TIME_UTC a conditional macro (some system headers already define it, so this prevents conflict) - respect HAVE_PTHREAD macro Reviewed-by: Brian Paul <brianp@vmware.com> Acked-by: Ian Romanick <ian.d.romanick@intel.com> Acked-by: Chad Versace <chad.versace@linux.intel.com>
Diffstat (limited to 'include/c11')
-rw-r--r--include/c11/threads.h58
-rw-r--r--include/c11/threads_posix.h346
-rw-r--r--include/c11/threads_win32.h588
3 files changed, 992 insertions, 0 deletions
diff --git a/include/c11/threads.h b/include/c11/threads.h
new file mode 100644
index 00000000000..4bb78b6500d
--- /dev/null
+++ b/include/c11/threads.h
@@ -0,0 +1,58 @@
+/*
+ * C11 <threads.h> emulation library
+ *
+ * (C) Copyright yohhoy 2012.
+ * Distributed under the Boost Software License, Version 1.0.
+ * (See copy at http://www.boost.org/LICENSE_1_0.txt)
+ */
+#ifndef EMULATED_THREADS_H_INCLUDED_
+#define EMULATED_THREADS_H_INCLUDED_
+
+#include <time.h>
+
+#ifndef TIME_UTC
+#define TIME_UTC 1
+#endif
+
+#include "c99_compat.h" /* for `inline` */
+
+/*---------------------------- types ----------------------------*/
+typedef void (*tss_dtor_t)(void*);
+typedef int (*thrd_start_t)(void*);
+
+struct xtime {
+ time_t sec;
+ long nsec;
+};
+typedef struct xtime xtime;
+
+
+/*-------------------- enumeration constants --------------------*/
+enum {
+ mtx_plain = 0,
+ mtx_try = 1,
+ mtx_timed = 2,
+ mtx_recursive = 4
+};
+
+enum {
+ thrd_success = 0, // succeeded
+ thrd_timeout, // timeout
+ thrd_error, // failed
+ thrd_busy, // resource busy
+ thrd_nomem // out of memory
+};
+
+/*-------------------------- functions --------------------------*/
+
+#if defined(_WIN32) && !defined(__CYGWIN__)
+#include "threads_win32.h"
+#elif defined(HAVE_PTHREAD)
+#include "threads_posix.h"
+#else
+#error Not supported on this platform.
+#endif
+
+
+
+#endif /* EMULATED_THREADS_H_INCLUDED_ */
diff --git a/include/c11/threads_posix.h b/include/c11/threads_posix.h
new file mode 100644
index 00000000000..463c93f45c9
--- /dev/null
+++ b/include/c11/threads_posix.h
@@ -0,0 +1,346 @@
+/*
+ * C11 <threads.h> emulation library
+ *
+ * (C) Copyright yohhoy 2012.
+ * Distributed under the Boost Software License, Version 1.0.
+ * (See copy at http://www.boost.org/LICENSE_1_0.txt)
+ */
+#include <stdlib.h>
+#include <assert.h>
+#include <limits.h>
+#include <errno.h>
+#include <unistd.h>
+#include <sched.h>
+#include <stdint.h> /* for intptr_t */
+
+/*
+Configuration macro:
+
+ EMULATED_THREADS_USE_NATIVE_TIMEDLOCK
+ Use pthread_mutex_timedlock() for `mtx_timedlock()'
+ Otherwise use mtx_trylock() + *busy loop* emulation.
+*/
+#if !defined(__CYGWIN__)
+#define EMULATED_THREADS_USE_NATIVE_TIMEDLOCK
+#endif
+
+
+#include <pthread.h>
+
+/*---------------------------- macros ----------------------------*/
+#define ONCE_FLAG_INIT PTHREAD_ONCE_INIT
+#ifdef INIT_ONCE_STATIC_INIT
+#define TSS_DTOR_ITERATIONS PTHREAD_DESTRUCTOR_ITERATIONS
+#else
+#define TSS_DTOR_ITERATIONS 1 // assume TSS dtor MAY be called at least once.
+#endif
+
+// FIXME: temporary non-standard hack to ease transition
+#define _MTX_INITIALIZER_NP PTHREAD_MUTEX_INITIALIZER
+
+/*---------------------------- types ----------------------------*/
+typedef pthread_cond_t cnd_t;
+typedef pthread_t thrd_t;
+typedef pthread_key_t tss_t;
+typedef pthread_mutex_t mtx_t;
+typedef pthread_once_t once_flag;
+
+
+/*
+Implementation limits:
+ - Conditionally emulation for "mutex with timeout"
+ (see EMULATED_THREADS_USE_NATIVE_TIMEDLOCK macro)
+*/
+struct impl_thrd_param {
+ thrd_start_t func;
+ void *arg;
+};
+
+static inline void *
+impl_thrd_routine(void *p)
+{
+ struct impl_thrd_param pack = *((struct impl_thrd_param *)p);
+ free(p);
+ return (void*)(intptr_t)pack.func(pack.arg);
+}
+
+
+/*--------------- 7.25.2 Initialization functions ---------------*/
+// 7.25.2.1
+static inline void
+call_once(once_flag *flag, void (*func)(void))
+{
+ pthread_once(flag, func);
+}
+
+
+/*------------- 7.25.3 Condition variable functions -------------*/
+// 7.25.3.1
+static inline int
+cnd_broadcast(cnd_t *cond)
+{
+ if (!cond) return thrd_error;
+ pthread_cond_broadcast(cond);
+ return thrd_success;
+}
+
+// 7.25.3.2
+static inline void
+cnd_destroy(cnd_t *cond)
+{
+ assert(cond);
+ pthread_cond_destroy(cond);
+}
+
+// 7.25.3.3
+static inline int
+cnd_init(cnd_t *cond)
+{
+ if (!cond) return thrd_error;
+ pthread_cond_init(cond, NULL);
+ return thrd_success;
+}
+
+// 7.25.3.4
+static inline int
+cnd_signal(cnd_t *cond)
+{
+ if (!cond) return thrd_error;
+ pthread_cond_signal(cond);
+ return thrd_success;
+}
+
+// 7.25.3.5
+static inline int
+cnd_timedwait(cnd_t *cond, mtx_t *mtx, const xtime *xt)
+{
+ struct timespec abs_time;
+ int rt;
+ if (!cond || !mtx || !xt) return thrd_error;
+ rt = pthread_cond_timedwait(cond, mtx, &abs_time);
+ if (rt == ETIMEDOUT)
+ return thrd_busy;
+ return (rt == 0) ? thrd_success : thrd_error;
+}
+
+// 7.25.3.6
+static inline int
+cnd_wait(cnd_t *cond, mtx_t *mtx)
+{
+ if (!cond || !mtx) return thrd_error;
+ pthread_cond_wait(cond, mtx);
+ return thrd_success;
+}
+
+
+/*-------------------- 7.25.4 Mutex functions --------------------*/
+// 7.25.4.1
+static inline void
+mtx_destroy(mtx_t *mtx)
+{
+ assert(mtx);
+ pthread_mutex_destroy(mtx);
+}
+
+// 7.25.4.2
+static inline int
+mtx_init(mtx_t *mtx, int type)
+{
+ pthread_mutexattr_t attr;
+ if (!mtx) return thrd_error;
+ if (type != mtx_plain && type != mtx_timed && type != mtx_try
+ && type != (mtx_plain|mtx_recursive)
+ && type != (mtx_timed|mtx_recursive)
+ && type != (mtx_try|mtx_recursive))
+ return thrd_error;
+ pthread_mutexattr_init(&attr);
+ if ((type & mtx_recursive) != 0) {
+#if defined(__linux__) || defined(__linux)
+ pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE_NP);
+#else
+ pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
+#endif
+ }
+ pthread_mutex_init(mtx, &attr);
+ pthread_mutexattr_destroy(&attr);
+ return thrd_success;
+}
+
+// 7.25.4.3
+static inline int
+mtx_lock(mtx_t *mtx)
+{
+ if (!mtx) return thrd_error;
+ pthread_mutex_lock(mtx);
+ return thrd_success;
+}
+
+// 7.25.4.4
+static inline int
+mtx_timedlock(mtx_t *mtx, const xtime *xt)
+{
+ if (!mtx || !xt) return thrd_error;
+ {
+#ifdef EMULATED_THREADS_USE_NATIVE_TIMEDLOCK
+ struct timespec ts;
+ int rt;
+ ts.tv_sec = xt->sec;
+ ts.tv_nsec = xt->nsec;
+ rt = pthread_mutex_timedlock(mtx, &ts);
+ if (rt == 0)
+ return thrd_success;
+ return (rt == ETIMEDOUT) ? thrd_busy : thrd_error;
+#else
+ time_t expire = time(NULL);
+ expire += xt->sec;
+ while (mtx_trylock(mtx) != thrd_success) {
+ time_t now = time(NULL);
+ if (expire < now)
+ return thrd_busy;
+ // busy loop!
+ thrd_yield();
+ }
+ return thrd_success;
+#endif
+ }
+}
+
+// 7.25.4.5
+static inline int
+mtx_trylock(mtx_t *mtx)
+{
+ if (!mtx) return thrd_error;
+ return (pthread_mutex_trylock(mtx) == 0) ? thrd_success : thrd_busy;
+}
+
+// 7.25.4.6
+static inline int
+mtx_unlock(mtx_t *mtx)
+{
+ if (!mtx) return thrd_error;
+ pthread_mutex_unlock(mtx);
+ return thrd_success;
+}
+
+
+/*------------------- 7.25.5 Thread functions -------------------*/
+// 7.25.5.1
+static inline int
+thrd_create(thrd_t *thr, thrd_start_t func, void *arg)
+{
+ struct impl_thrd_param *pack;
+ if (!thr) return thrd_error;
+ pack = (struct impl_thrd_param *)malloc(sizeof(struct impl_thrd_param));
+ if (!pack) return thrd_nomem;
+ pack->func = func;
+ pack->arg = arg;
+ if (pthread_create(thr, NULL, impl_thrd_routine, pack) != 0) {
+ free(pack);
+ return thrd_error;
+ }
+ return thrd_success;
+}
+
+// 7.25.5.2
+static inline thrd_t
+thrd_current(void)
+{
+ return pthread_self();
+}
+
+// 7.25.5.3
+static inline int
+thrd_detach(thrd_t thr)
+{
+ return (pthread_detach(thr) == 0) ? thrd_success : thrd_error;
+}
+
+// 7.25.5.4
+static inline int
+thrd_equal(thrd_t thr0, thrd_t thr1)
+{
+ return pthread_equal(thr0, thr1);
+}
+
+// 7.25.5.5
+static inline void
+thrd_exit(int res)
+{
+ pthread_exit((void*)(intptr_t)res);
+}
+
+// 7.25.5.6
+static inline int
+thrd_join(thrd_t thr, int *res)
+{
+ void *code;
+ if (pthread_join(thr, &code) != 0)
+ return thrd_error;
+ if (res)
+ *res = (int)(intptr_t)code;
+ return thrd_success;
+}
+
+// 7.25.5.7
+static inline void
+thrd_sleep(const xtime *xt)
+{
+ struct timespec req;
+ assert(xt);
+ req.tv_sec = xt->sec;
+ req.tv_nsec = xt->nsec;
+ nanosleep(&req, NULL);
+}
+
+// 7.25.5.8
+static inline void
+thrd_yield(void)
+{
+ sched_yield();
+}
+
+
+/*----------- 7.25.6 Thread-specific storage functions -----------*/
+// 7.25.6.1
+static inline int
+tss_create(tss_t *key, tss_dtor_t dtor)
+{
+ if (!key) return thrd_error;
+ return (pthread_key_create(key, dtor) == 0) ? thrd_success : thrd_error;
+}
+
+// 7.25.6.2
+static inline void
+tss_delete(tss_t key)
+{
+ pthread_key_delete(key);
+}
+
+// 7.25.6.3
+static inline void *
+tss_get(tss_t key)
+{
+ return pthread_getspecific(key);
+}
+
+// 7.25.6.4
+static inline int
+tss_set(tss_t key, void *val)
+{
+ return (pthread_setspecific(key, val) == 0) ? thrd_success : thrd_error;
+}
+
+
+/*-------------------- 7.25.7 Time functions --------------------*/
+// 7.25.6.1
+static inline int
+xtime_get(xtime *xt, int base)
+{
+ if (!xt) return 0;
+ if (base == TIME_UTC) {
+ xt->sec = time(NULL);
+ xt->nsec = 0;
+ return base;
+ }
+ return 0;
+}
diff --git a/include/c11/threads_win32.h b/include/c11/threads_win32.h
new file mode 100644
index 00000000000..5a63e90b3a7
--- /dev/null
+++ b/include/c11/threads_win32.h
@@ -0,0 +1,588 @@
+/*
+ * C11 <threads.h> emulation library
+ *
+ * (C) Copyright yohhoy 2012.
+ * Distributed under the Boost Software License, Version 1.0.
+ * (See copy at http://www.boost.org/LICENSE_1_0.txt)
+ */
+#include <assert.h>
+#include <limits.h>
+#include <errno.h>
+#include <process.h> // MSVCRT
+
+/*
+Configuration macro:
+
+ EMULATED_THREADS_USE_NATIVE_CALL_ONCE
+ Use native WindowsAPI one-time initialization function.
+ (requires WinVista or later)
+ Otherwise emulate by mtx_trylock() + *busy loop* for WinXP.
+
+ EMULATED_THREADS_USE_NATIVE_CV
+ Use native WindowsAPI condition variable object.
+ (requires WinVista or later)
+ Otherwise use emulated implementation for WinXP.
+
+ EMULATED_THREADS_TSS_DTOR_SLOTNUM
+ Max registerable TSS dtor number.
+*/
+
+// XXX: Retain XP compatability
+#if 0
+#if _WIN32_WINNT >= 0x0600
+// Prefer native WindowsAPI on newer environment.
+#if !defined(__MINGW32__)
+#define EMULATED_THREADS_USE_NATIVE_CALL_ONCE
+#endif
+#define EMULATED_THREADS_USE_NATIVE_CV
+#endif
+#endif
+#define EMULATED_THREADS_TSS_DTOR_SLOTNUM 64 // see TLS_MINIMUM_AVAILABLE
+
+
+#include <windows.h>
+
+// check configuration
+#if defined(EMULATED_THREADS_USE_NATIVE_CALL_ONCE) && (_WIN32_WINNT < 0x0600)
+#error EMULATED_THREADS_USE_NATIVE_CALL_ONCE requires _WIN32_WINNT>=0x0600
+#endif
+
+#if defined(EMULATED_THREADS_USE_NATIVE_CV) && (_WIN32_WINNT < 0x0600)
+#error EMULATED_THREADS_USE_NATIVE_CV requires _WIN32_WINNT>=0x0600
+#endif
+
+
+/*---------------------------- macros ----------------------------*/
+#ifdef EMULATED_THREADS_USE_NATIVE_CALL_ONCE
+#define ONCE_FLAG_INIT INIT_ONCE_STATIC_INIT
+#else
+#define ONCE_FLAG_INIT {0}
+#endif
+#define TSS_DTOR_ITERATIONS 1
+
+// FIXME: temporary non-standard hack to ease transition
+#define _MTX_INITIALIZER_NP {(PCRITICAL_SECTION_DEBUG)-1, -1, 0, 0, 0, 0}
+
+/*---------------------------- types ----------------------------*/
+typedef struct cnd_t {
+#ifdef EMULATED_THREADS_USE_NATIVE_CV
+ CONDITION_VARIABLE condvar;
+#else
+ int blocked;
+ int gone;
+ int to_unblock;
+ HANDLE sem_queue;
+ HANDLE sem_gate;
+ CRITICAL_SECTION monitor;
+#endif
+} cnd_t;
+
+typedef HANDLE thrd_t;
+
+typedef DWORD tss_t;
+
+typedef CRITICAL_SECTION mtx_t;
+
+#ifdef EMULATED_THREADS_USE_NATIVE_CALL_ONCE
+typedef INIT_ONCE once_flag;
+#else
+typedef struct once_flag_t {
+ volatile LONG status;
+} once_flag;
+#endif
+
+
+static inline void * tss_get(tss_t key);
+static inline void thrd_yield(void);
+static inline int mtx_trylock(mtx_t *mtx);
+static inline int mtx_lock(mtx_t *mtx);
+static inline int mtx_unlock(mtx_t *mtx);
+
+/*
+Implementation limits:
+ - Conditionally emulation for "Initialization functions"
+ (see EMULATED_THREADS_USE_NATIVE_CALL_ONCE macro)
+ - Emulated `mtx_timelock()' with mtx_trylock() + *busy loop*
+*/
+static void impl_tss_dtor_invoke(void); // forward decl.
+
+struct impl_thrd_param {
+ thrd_start_t func;
+ void *arg;
+};
+
+static unsigned __stdcall impl_thrd_routine(void *p)
+{
+ struct impl_thrd_param pack;
+ int code;
+ memcpy(&pack, p, sizeof(struct impl_thrd_param));
+ free(p);
+ code = pack.func(pack.arg);
+ impl_tss_dtor_invoke();
+ return (unsigned)code;
+}
+
+static DWORD impl_xtime2msec(const xtime *xt)
+{
+ return (DWORD)((xt->sec * 1000u) + (xt->nsec / 1000));
+}
+
+#ifdef EMULATED_THREADS_USE_NATIVE_CALL_ONCE
+struct impl_call_once_param { void (*func)(void); };
+static BOOL CALLBACK impl_call_once_callback(PINIT_ONCE InitOnce, PVOID Parameter, PVOID *Context)
+{
+ struct impl_call_once_param *param = (struct impl_call_once_param*)Parameter;
+ (param->func)();
+ ((void)InitOnce); ((void)Context); // suppress warning
+ return TRUE;
+}
+#endif // ifdef EMULATED_THREADS_USE_NATIVE_CALL_ONCE
+
+#ifndef EMULATED_THREADS_USE_NATIVE_CV
+/*
+Note:
+ The implementation of condition variable is ported from Boost.Interprocess
+ See http://www.boost.org/boost/interprocess/sync/windows/condition.hpp
+*/
+static void impl_cond_do_signal(cnd_t *cond, int broadcast)
+{
+ int nsignal = 0;
+
+ EnterCriticalSection(&cond->monitor);
+ if (cond->to_unblock != 0) {
+ if (cond->blocked == 0) {
+ LeaveCriticalSection(&cond->monitor);
+ return;
+ }
+ if (broadcast) {
+ cond->to_unblock += nsignal = cond->blocked;
+ cond->blocked = 0;
+ } else {
+ nsignal = 1;
+ cond->to_unblock++;
+ cond->blocked--;
+ }
+ } else if (cond->blocked > cond->gone) {
+ WaitForSingleObject(cond->sem_gate, INFINITE);
+ if (cond->gone != 0) {
+ cond->blocked -= cond->gone;
+ cond->gone = 0;
+ }
+ if (broadcast) {
+ nsignal = cond->to_unblock = cond->blocked;
+ cond->blocked = 0;
+ } else {
+ nsignal = cond->to_unblock = 1;
+ cond->blocked--;
+ }
+ }
+ LeaveCriticalSection(&cond->monitor);
+
+ if (0 < nsignal)
+ ReleaseSemaphore(cond->sem_queue, nsignal, NULL);
+}
+
+static int impl_cond_do_wait(cnd_t *cond, mtx_t *mtx, const xtime *xt)
+{
+ int nleft = 0;
+ int ngone = 0;
+ int timeout = 0;
+ DWORD w;
+
+ WaitForSingleObject(cond->sem_gate, INFINITE);
+ cond->blocked++;
+ ReleaseSemaphore(cond->sem_gate, 1, NULL);
+
+ mtx_unlock(mtx);
+
+ w = WaitForSingleObject(cond->sem_queue, xt ? impl_xtime2msec(xt) : INFINITE);
+ timeout = (w == WAIT_TIMEOUT);
+
+ EnterCriticalSection(&cond->monitor);
+ if ((nleft = cond->to_unblock) != 0) {
+ if (timeout) {
+ if (cond->blocked != 0) {
+ cond->blocked--;
+ } else {
+ cond->gone++;
+ }
+ }
+ if (--cond->to_unblock == 0) {
+ if (cond->blocked != 0) {
+ ReleaseSemaphore(cond->sem_gate, 1, NULL);
+ nleft = 0;
+ }
+ else if ((ngone = cond->gone) != 0) {
+ cond->gone = 0;
+ }
+ }
+ } else if (++cond->gone == INT_MAX/2) {
+ WaitForSingleObject(cond->sem_gate, INFINITE);
+ cond->blocked -= cond->gone;
+ ReleaseSemaphore(cond->sem_gate, 1, NULL);
+ cond->gone = 0;
+ }
+ LeaveCriticalSection(&cond->monitor);
+
+ if (nleft == 1) {
+ while (ngone--)
+ WaitForSingleObject(cond->sem_queue, INFINITE);
+ ReleaseSemaphore(cond->sem_gate, 1, NULL);
+ }
+
+ mtx_lock(mtx);
+ return timeout ? thrd_busy : thrd_success;
+}
+#endif // ifndef EMULATED_THREADS_USE_NATIVE_CV
+
+static struct impl_tss_dtor_entry {
+ tss_t key;
+ tss_dtor_t dtor;
+} impl_tss_dtor_tbl[EMULATED_THREADS_TSS_DTOR_SLOTNUM];
+
+static int impl_tss_dtor_register(tss_t key, tss_dtor_t dtor)
+{
+ int i;
+ for (i = 0; i < EMULATED_THREADS_TSS_DTOR_SLOTNUM; i++) {
+ if (!impl_tss_dtor_tbl[i].dtor)
+ break;
+ }
+ if (i == EMULATED_THREADS_TSS_DTOR_SLOTNUM)
+ return 1;
+ impl_tss_dtor_tbl[i].key = key;
+ impl_tss_dtor_tbl[i].dtor = dtor;
+ return 0;
+}
+
+static void impl_tss_dtor_invoke()
+{
+ int i;
+ for (i = 0; i < EMULATED_THREADS_TSS_DTOR_SLOTNUM; i++) {
+ if (impl_tss_dtor_tbl[i].dtor) {
+ void* val = tss_get(impl_tss_dtor_tbl[i].key);
+ if (val)
+ (impl_tss_dtor_tbl[i].dtor)(val);
+ }
+ }
+}
+
+
+/*--------------- 7.25.2 Initialization functions ---------------*/
+// 7.25.2.1
+static inline void
+call_once(once_flag *flag, void (*func)(void))
+{
+ assert(!flag && !func);
+#ifdef EMULATED_THREADS_USE_NATIVE_CALL_ONCE
+ {
+ struct impl_call_once_param param;
+ param.func = func;
+ InitOnceExecuteOnce(flag, impl_call_once_callback, (PVOID)&param, NULL);
+ }
+#else
+ if (InterlockedCompareExchange(&flag->status, 1, 0) == 0) {
+ (func)();
+ InterlockedExchange(&flag->status, 2);
+ } else {
+ while (flag->status == 1) {
+ // busy loop!
+ thrd_yield();
+ }
+ }
+#endif
+}
+
+
+/*------------- 7.25.3 Condition variable functions -------------*/
+// 7.25.3.1
+static inline int
+cnd_broadcast(cnd_t *cond)
+{
+ if (!cond) return thrd_error;
+#ifdef EMULATED_THREADS_USE_NATIVE_CV
+ WakeAllConditionVariable(&cond->condvar);
+#else
+ impl_cond_do_signal(cond, 1);
+#endif
+ return thrd_success;
+}
+
+// 7.25.3.2
+static inline void
+cnd_destroy(cnd_t *cond)
+{
+ assert(cond);
+#ifdef EMULATED_THREADS_USE_NATIVE_CV
+ // do nothing
+#else
+ CloseHandle(cond->sem_queue);
+ CloseHandle(cond->sem_gate);
+ DeleteCriticalSection(&cond->monitor);
+#endif
+}
+
+// 7.25.3.3
+static inline int
+cnd_init(cnd_t *cond)
+{
+ if (!cond) return thrd_error;
+#ifdef EMULATED_THREADS_USE_NATIVE_CV
+ InitializeConditionVariable(&cond->condvar);
+#else
+ cond->blocked = 0;
+ cond->gone = 0;
+ cond->to_unblock = 0;
+ cond->sem_queue = CreateSemaphore(NULL, 0, LONG_MAX, NULL);
+ cond->sem_gate = CreateSemaphore(NULL, 1, 1, NULL);
+ InitializeCriticalSection(&cond->monitor);
+#endif
+ return thrd_success;
+}
+
+// 7.25.3.4
+static inline int
+cnd_signal(cnd_t *cond)
+{
+ if (!cond) return thrd_error;
+#ifdef EMULATED_THREADS_USE_NATIVE_CV
+ WakeConditionVariable(&cond->condvar);
+#else
+ impl_cond_do_signal(cond, 0);
+#endif
+ return thrd_success;
+}
+
+// 7.25.3.5
+static inline int
+cnd_timedwait(cnd_t *cond, mtx_t *mtx, const xtime *xt)
+{
+ if (!cond || !mtx || !xt) return thrd_error;
+#ifdef EMULATED_THREADS_USE_NATIVE_CV
+ if (SleepConditionVariableCS(&cond->condvar, mtx, impl_xtime2msec(xt)))
+ return thrd_success;
+ return (GetLastError() == ERROR_TIMEOUT) ? thrd_busy : thrd_error;
+#else
+ return impl_cond_do_wait(cond, mtx, xt);
+#endif
+}
+
+// 7.25.3.6
+static inline int
+cnd_wait(cnd_t *cond, mtx_t *mtx)
+{
+ if (!cond || !mtx) return thrd_error;
+#ifdef EMULATED_THREADS_USE_NATIVE_CV
+ SleepConditionVariableCS(&cond->condvar, mtx, INFINITE);
+#else
+ impl_cond_do_wait(cond, mtx, NULL);
+#endif
+ return thrd_success;
+}
+
+
+/*-------------------- 7.25.4 Mutex functions --------------------*/
+// 7.25.4.1
+static inline void
+mtx_destroy(mtx_t *mtx)
+{
+ assert(mtx);
+ DeleteCriticalSection(mtx);
+}
+
+// 7.25.4.2
+static inline int
+mtx_init(mtx_t *mtx, int type)
+{
+ if (!mtx) return thrd_error;
+ if (type != mtx_plain && type != mtx_timed && type != mtx_try
+ && type != (mtx_plain|mtx_recursive)
+ && type != (mtx_timed|mtx_recursive)
+ && type != (mtx_try|mtx_recursive))
+ return thrd_error;
+ InitializeCriticalSection(mtx);
+ return thrd_success;
+}
+
+// 7.25.4.3
+static inline int
+mtx_lock(mtx_t *mtx)
+{
+ if (!mtx) return thrd_error;
+ EnterCriticalSection(mtx);
+ return thrd_success;
+}
+
+// 7.25.4.4
+static inline int
+mtx_timedlock(mtx_t *mtx, const xtime *xt)
+{
+ time_t expire, now;
+ if (!mtx || !xt) return thrd_error;
+ expire = time(NULL);
+ expire += xt->sec;
+ while (mtx_trylock(mtx) != thrd_success) {
+ now = time(NULL);
+ if (expire < now)
+ return thrd_busy;
+ // busy loop!
+ thrd_yield();
+ }
+ return thrd_success;
+}
+
+// 7.25.4.5
+static inline int
+mtx_trylock(mtx_t *mtx)
+{
+ if (!mtx) return thrd_error;
+ return TryEnterCriticalSection(mtx) ? thrd_success : thrd_busy;
+}
+
+// 7.25.4.6
+static inline int
+mtx_unlock(mtx_t *mtx)
+{
+ if (!mtx) return thrd_error;
+ LeaveCriticalSection(mtx);
+ return thrd_success;
+}
+
+
+/*------------------- 7.25.5 Thread functions -------------------*/
+// 7.25.5.1
+static inline int
+thrd_create(thrd_t *thr, thrd_start_t func, void *arg)
+{
+ struct impl_thrd_param *pack;
+ uintptr_t handle;
+ if (!thr) return thrd_error;
+ pack = (struct impl_thrd_param *)malloc(sizeof(struct impl_thrd_param));
+ if (!pack) return thrd_nomem;
+ pack->func = func;
+ pack->arg = arg;
+ handle = _beginthreadex(NULL, 0, impl_thrd_routine, pack, 0, NULL);
+ if (handle == 0) {
+ if (errno == EAGAIN || errno == EACCES)
+ return thrd_nomem;
+ return thrd_error;
+ }
+ *thr = (thrd_t)handle;
+ return thrd_success;
+}
+
+// 7.25.5.2
+static inline thrd_t
+thrd_current(void)
+{
+ return GetCurrentThread();
+}
+
+// 7.25.5.3
+static inline int
+thrd_detach(thrd_t thr)
+{
+ CloseHandle(thr);
+ return thrd_success;
+}
+
+// 7.25.5.4
+static inline int
+thrd_equal(thrd_t thr0, thrd_t thr1)
+{
+ return (thr0 == thr1);
+}
+
+// 7.25.5.5
+static inline void
+thrd_exit(int res)
+{
+ impl_tss_dtor_invoke();
+ _endthreadex((unsigned)res);
+}
+
+// 7.25.5.6
+static inline int
+thrd_join(thrd_t thr, int *res)
+{
+ DWORD w, code;
+ w = WaitForSingleObject(thr, INFINITE);
+ if (w != WAIT_OBJECT_0)
+ return thrd_error;
+ if (res) {
+ if (!GetExitCodeThread(thr, &code)) {
+ CloseHandle(thr);
+ return thrd_error;
+ }
+ *res = (int)code;
+ }
+ CloseHandle(thr);
+ return thrd_success;
+}
+
+// 7.25.5.7
+static inline void
+thrd_sleep(const xtime *xt)
+{
+ assert(xt);
+ Sleep(impl_xtime2msec(xt));
+}
+
+// 7.25.5.8
+static inline void
+thrd_yield(void)
+{
+ SwitchToThread();
+}
+
+
+/*----------- 7.25.6 Thread-specific storage functions -----------*/
+// 7.25.6.1
+static inline int
+tss_create(tss_t *key, tss_dtor_t dtor)
+{
+ if (!key) return thrd_error;
+ *key = TlsAlloc();
+ if (dtor) {
+ if (impl_tss_dtor_register(*key, dtor)) {
+ TlsFree(*key);
+ return thrd_error;
+ }
+ }
+ return (*key != 0xFFFFFFFF) ? thrd_success : thrd_error;
+}
+
+// 7.25.6.2
+static inline void
+tss_delete(tss_t key)
+{
+ TlsFree(key);
+}
+
+// 7.25.6.3
+static inline void *
+tss_get(tss_t key)
+{
+ return TlsGetValue(key);
+}
+
+// 7.25.6.4
+static inline int
+tss_set(tss_t key, void *val)
+{
+ return TlsSetValue(key, val) ? thrd_success : thrd_error;
+}
+
+
+/*-------------------- 7.25.7 Time functions --------------------*/
+// 7.25.6.1
+static inline int
+xtime_get(xtime *xt, int base)
+{
+ if (!xt) return 0;
+ if (base == TIME_UTC) {
+ xt->sec = time(NULL);
+ xt->nsec = 0;
+ return base;
+ }
+ return 0;
+}