try to accomodate apple

io.h

@@ -209,13 +209,16 @@ int64 io_mmapwritefile(int64 out,int64 in,uint64 off,uint64 bytes,io_write_callb
 unsigned int io_debugstring(int64 s,char* buf,unsigned int bufsize);
 
 #ifdef __MINGW32__
+// https://github.com/lhmouse/mcfgthread
 #include <mcfgthread/c11.h>
 #elif defined(__dietlibc__)
 #include <threads.h>
 #else
 #include <pthread.h>
+#ifndef __APPLE__
 #include <semaphore.h>
 #endif
+#endif
 
 enum { SLOTS=128 };
 typedef struct iomux {
@@ -228,6 +231,9 @@ typedef struct iomux {
 #if defined(__MINGW32__) || defined(__dietlibc__)
   mtx_t mtx;
   cnd_t sem;
+#elif defined(__APPLE__)
+  pthread_mutex_t mtx;
+  pthread_cond_t sem;
 #else
   sem_t sem;
 #endif
@@ -253,6 +259,7 @@ int iom_add(iomux_t* c,int64 s,unsigned int events);
 int iom_wait(iomux_t* c,int64* s,unsigned int* revents,unsigned long timeout);
 
 /* Call this to terminate all threads waiting in iom_wait */
+/* Returns 0 on success, -1 on failure */
 int iom_abort(iomux_t* c);
 
 #ifdef __cplusplus

io/iom_abort.c

@@ -3,7 +3,9 @@
 int iom_abort(iomux_t* c) {
   c->working=-2;
 #ifdef __dietlibc__
-  return cnd_broadcast(&c->sem);
+  return cnd_broadcast(&c->sem) == thrd_success ? 0 : -1;
+#elif defined(__APPLE__)
+  return pthread_cond_broadcast(&c->sem) == 0 ? 0 : -1;
 #else
   return sem_post(&c->sem);
 #endif

io/iom_init.c

@@ -33,6 +33,9 @@ int iom_init(iomux_t* c) {
 #ifdef __dietlibc__
   mtx_init(&c->mtx, mtx_timed);
   cnd_init(&c->sem);
+#elif defined(__APPLE__)
+  pthread_mutex_init(&c->mtx, 0);
+  pthread_cond_init(&c->sem, 0);
 #else
   sem_init(&c->sem, 0, 1);
 #endif

io/iom_wait.c

@@ -79,6 +79,8 @@ int iom_wait(iomux_t* c,int64* s,unsigned int* revents,unsigned long timeout) {
 	// not transient, then they will also get an error and wake the
 	// next up
 	cnd_signal(&c->sem);
+#elif defined(__APPLE__)
+	pthread_cond_signal(&c->sem);
 #else
 	sem_post(&c->sem);
 #endif
@@ -117,6 +119,8 @@ int iom_wait(iomux_t* c,int64* s,unsigned int* revents,unsigned long timeout) {
 #ifdef __dietlibc__
 	// no dietlibc for kqueue based systems yet
 	cnd_broadcast(&c->sem);
+#elif defined(__APPLE__)
+	pthread_cond_broadcast(&c->sem);
 #else
 	sem_post(&c->sem);
 #endif
@@ -155,6 +159,11 @@ int iom_wait(iomux_t* c,int64* s,unsigned int* revents,unsigned long timeout) {
 	cnd_signal(&c->sem);
       else
 	cnd_broadcast(&c->sem);
+#elif defined(__APPLE__)
+      if (c->h == (c->l + 1) % SLOTS)
+	pthread_cond_signal(&c->sem);
+      else
+	pthread_cond_broadcast(&c->sem);
 #else
       sem_post(&c->sem);
 #endif
@@ -166,6 +175,8 @@ int iom_wait(iomux_t* c,int64* s,unsigned int* revents,unsigned long timeout) {
       ts.tv_nsec = (timeout % 1000) * 1000000;
 #ifdef __dietlibc__
       r=cnd_timedwait(&c->sem,&c->mtx,&ts);
+#elif defined(__APPLE__)
+      r=pthread_cond_timedwait(&c->sem,&c->mtx,&ts);
 #else
       r=sem_timedwait(&c->sem,&ts);
 #endif