CoreFoundation: introduce _CFMutex, _CFRecursiveMutex

Introduce the `_CFMutex` and `_CFRecursiveMutex` types to allow us to
differentiate between recursive and non-recursive mutexes and be able to replace
them on different platforms.  This codepath does not use `CFLock_t` as these are
expected to be full mutexes rather than unfair locks.

Author: compnerd

CoreFoundation/Base.subproj/CFInternal.h

@@ -592,6 +592,84 @@ static void os_unfair_lock_unlock(os_unfair_lock_t lock) { pthread_mutex_unlock(
 #define os_unfair_lock_unlock __CFUnlock
 #endif // __has_include(<os/lock.h>)
 
+#if _POSIX_THREADS
+typedef pthread_mutex_t _CFMutex;
+#define _CF_MUTEX_STATIC_INITIALIZER PTHREAD_MUTEX_INITIALIZER
+static int _CFMutexCreate(_CFMutex *lock) {
+  return pthread_mutex_init(lock, NULL);
+}
+static int _CFMutexDestroy(_CFMutex *lock) {
+  return pthread_mutex_destroy(lock);
+}
+static int _CFMutexLock(_CFMutex *lock) {
+  return pthread_mutex_lock(lock);
+}
+static int _CFMutexUnlock(_CFMutex *lock) {
+  return pthread_mutex_unlock(lock);
+}
+
+typedef pthread_mutex_t _CFRecursiveMutex;
+static int _CFRecursiveMutexCreate(_CFRecursiveMutex *mutex) {
+  pthread_mutexattr_t attr;
+  pthread_mutexattr_init(&attr);
+  pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
+
+  int result = pthread_mutex_init(mutex, &attr);
+
+  pthread_mutexattr_destroy(&attr);
+
+  return result;
+}
+static int _CFRecursiveMutexDestroy(_CFRecursiveMutex *mutex) {
+  return pthread_mutex_destroy(mutex);
+}
+static int _CFRecursiveMutexLock(_CFRecursiveMutex *mutex) {
+  return pthread_mutex_lock(mutex);
+}
+static int _CFRecursiveMutexUnlock(_CFRecursiveMutex *mutex) {
+  return pthread_mutex_unlock(mutex);
+}
+#elif defined(_WIN32)
+typedef SRWLOCK _CFMutex;
+#define _CF_MUTEX_STATIC_INITIALIZER SRWLOCK_INIT
+static int _CFMutexCreate(_CFMutex *lock) {
+  InitializeSRWLock(lock);
+  return 0;
+}
+static int _CFMutexDestroy(_CFMutex *lock) {
+  (void)lock;
+  return 0;
+}
+static int _CFMutexLock(_CFMutex *lock) {
+  AcquireSRWLockExclusive(lock);
+  return 0;
+}
+static int _CFMutexUnlock(_CFMutex *lock) {
+  ReleaseSRWLockExclusive(lock);
+  return 0;
+}
+
+typedef CRITICAL_SECTION _CFRecursiveMutex;
+static int _CFRecursiveMutexCreate(_CFRecursiveMutex *mutex) {
+  InitializeCriticalSection(mutex);
+  return 0;
+}
+static int _CFRecursiveMutexDestroy(_CFRecursiveMutex *mutex) {
+  DeleteCriticalSection(mutex);
+  return 0;
+}
+static int _CFRecursiveMutexLock(_CFRecursiveMutex *mutex) {
+  EnterCriticalSection(mutex);
+  return 0;
+}
+static int _CFRecursiveMutexUnlock(_CFRecursiveMutex *mutex) {
+  LeaveCriticalSection(mutex);
+  return 0;
+}
+#else
+#error "do not know how to define mutex and recursive mutex for this OS"
+#endif
+
 #if !__HAS_DISPATCH__
 
 typedef volatile long dispatch_once_t;

CoreFoundation/Locale.subproj/CFDateFormatter.c

@@ -58,7 +58,7 @@ CFArrayRef CFDateFormatterCreateDateFormatsFromTemplates(CFAllocatorRef allocato
 
 static Boolean useTemplatePatternGenerator(CFLocaleRef locale, void(^work)(UDateTimePatternGenerator *ptg)) {
     static UDateTimePatternGenerator *ptg;
-    static pthread_mutex_t ptgLock = PTHREAD_MUTEX_INITIALIZER;
+    static _CFMutex ptgLock = _CF_MUTEX_STATIC_INITIALIZER;
     static const char *ptgLocaleName;
     CFStringRef ln = locale ? CFLocaleGetIdentifier(locale) : CFSTR("");
     char buffer[BUFFER_SIZE];
@@ -73,7 +73,7 @@ static Boolean useTemplatePatternGenerator(CFLocaleRef locale, void(^work)(UDate
         free((void *)ptgLocaleName);
         ptgLocaleName = NULL;
     };
-    pthread_mutex_lock(&ptgLock);
+    _CFMutexLock(&ptgLock);
     if (ptgLocaleName && strcmp(ptgLocaleName, localeName) != 0) {
         flushCache();
     }
@@ -88,7 +88,7 @@ static Boolean useTemplatePatternGenerator(CFLocaleRef locale, void(^work)(UDate
     if (result && work) {
         work(ptg);
     }
-    pthread_mutex_unlock(&ptgLock);
+    _CFMutexUnlock(&ptgLock);
     return result;
 }