int online_cpus(void)
{
+#ifdef NO_PTHREADS
+ return 1;
+#else
#ifdef _SC_NPROCESSORS_ONLN
long ncpus;
#endif
#endif
return 1;
+#endif
}
int init_recursive_mutex(pthread_mutex_t *m)
{
+#ifndef NO_PTHREADS
pthread_mutexattr_t a;
int ret;
pthread_mutexattr_destroy(&a);
}
return ret;
+#else
+ return 0;
+#endif
+}
+
+#ifdef NO_PTHREADS
+int dummy_pthread_create(pthread_t *pthread, const void *attr,
+ void *(*fn)(void *), void *data)
+{
+ /*
+ * Do nothing.
+ *
+ * The main purpose of this function is to break compiler's
+ * flow analysis and avoid -Wunused-variable false warnings.
+ */
+ return ENOSYS;
+}
+
+int dummy_pthread_init(void *data)
+{
+ /*
+ * Do nothing.
+ *
+ * The main purpose of this function is to break compiler's
+ * flow analysis or it may realize that functions like
+ * pthread_mutex_init() is no-op, which means the (static)
+ * variable is not used/initialized at all and trigger
+ * -Wunused-variable
+ */
+ return ENOSYS;
}
+
+int dummy_pthread_join(pthread_t pthread, void **retval)
+{
+ /*
+ * Do nothing.
+ *
+ * The main purpose of this function is to break compiler's
+ * flow analysis and avoid -Wunused-variable false warnings.
+ */
+ return ENOSYS;
+}
+
+#endif
#ifndef NO_PTHREADS
#include <pthread.h>
-extern int online_cpus(void);
-extern int init_recursive_mutex(pthread_mutex_t*);
+#define HAVE_THREADS 1
#else
-#define online_cpus() 1
+#define HAVE_THREADS 0
+
+/*
+ * macros instead of typedefs because pthread definitions may have
+ * been pulled in by some system dependencies even though the user
+ * wants to disable pthread.
+ */
+#define pthread_t int
+#define pthread_mutex_t int
+#define pthread_cond_t int
+#define pthread_key_t int
+
+#define pthread_mutex_init(mutex, attr) dummy_pthread_init(mutex)
+#define pthread_mutex_lock(mutex)
+#define pthread_mutex_unlock(mutex)
+#define pthread_mutex_destroy(mutex)
+
+#define pthread_cond_init(cond, attr) dummy_pthread_init(cond)
+#define pthread_cond_wait(cond, mutex)
+#define pthread_cond_signal(cond)
+#define pthread_cond_broadcast(cond)
+#define pthread_cond_destroy(cond)
+
+#define pthread_key_create(key, attr) dummy_pthread_init(key)
+#define pthread_key_delete(key)
+
+#define pthread_create(thread, attr, fn, data) \
+ dummy_pthread_create(thread, attr, fn, data)
+#define pthread_join(thread, retval) \
+ dummy_pthread_join(thread, retval)
+
+#define pthread_setspecific(key, data)
+#define pthread_getspecific(key) NULL
+
+int dummy_pthread_create(pthread_t *pthread, const void *attr,
+ void *(*fn)(void *), void *data);
+int dummy_pthread_join(pthread_t pthread, void **retval);
+
+int dummy_pthread_init(void *);
#endif
+
+int online_cpus(void);
+int init_recursive_mutex(pthread_mutex_t*);
+
+
#endif /* THREAD_COMPAT_H */