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thread: switch mutex wrappers to SRW locks

--- a/src/thread.h

+++ b/src/thread.h

@@ -34,7 +34,7 @@

 #define PTHREAD_ONCE_INIT INIT_ONCE_STATIC_INIT

-typedef CRITICAL_SECTION pthread_mutex_t;

+typedef SRWLOCK pthread_mutex_t;

 typedef CONDITION_VARIABLE pthread_cond_t;

 typedef INIT_ONCE pthread_once_t;

 typedef void *pthread_t;

@@ -52,19 +52,19 @@

                                       const pthread_mutexattr_t* attr)

 {

     (void)attr;

-    InitializeCriticalSection(mutex);

+    InitializeSRWLock(mutex);

 }

 static inline void pthread_mutex_destroy(pthread_mutex_t* mutex) {

-    DeleteCriticalSection(mutex);

+    (void)mutex;

 }

 static inline void pthread_mutex_lock(pthread_mutex_t* mutex) {

-    EnterCriticalSection(mutex);

+    AcquireSRWLockExclusive(mutex);

 }

 static inline void pthread_mutex_unlock(pthread_mutex_t* mutex) {

-    LeaveCriticalSection(mutex);

+    ReleaseSRWLockExclusive(mutex);

 }

 static inline void pthread_cond_init(pthread_cond_t* cond, const pthread_condattr_t* attr) {

@@ -77,7 +77,7 @@

 }

 static inline void pthread_cond_wait(pthread_cond_t* cond, pthread_mutex_t* mutex) {

-    SleepConditionVariableCS(cond, mutex, INFINITE);

+    SleepConditionVariableSRW(cond, mutex, INFINITE, 0);

 }

 static inline void pthread_cond_signal(pthread_cond_t* cond) {