pthread: Add enough so that coreutils/src/sort.c compiles.

[gnulib.git] / lib / pthread.in.h

diff --git a/lib/pthread.in.h b/lib/pthread.in.h
index 89fbc03..bb201a2 100644 (file)
--- a/lib/pthread.in.h
+++ b/lib/pthread.in.h
@@ -1,4 +1,4 @@
-/* Implement a trivial subset of the pthreads library.
+/* Implement a trivial subset of POSIX 1003.1-2008 pthread.h.
 
    Copyright (C) 2009, 2010 Free Software Foundation, Inc.
 
@@ -16,31 +16,195 @@
    along with this program; if not, write to the Free Software Foundation,
    Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
 
-/* Written by Glen Lenker.  */
+/* Written by Paul Eggert and Glen Lenker.  */
 
-#ifndef PTHREAD_H_
-# define PTHREAD_H_
+#ifndef _GL_PTHREAD_H_
+#define _GL_PTHREAD_H_
 
-# include <errno.h>
-# include <stdlib.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <sched.h>
+#include <sys/types.h>
+#include <time.h>
 
-typedef int pthread_t;
-typedef int pthread_attr_t;
+#ifndef HAVE_PTHREAD_T
+ typedef int pthread_t;
+ typedef int pthread_attr_t;
+ typedef int pthread_barrier_t;
+ typedef int pthread_barrierattr_t;
+ typedef int pthread_cond_t;
+ typedef int pthread_condattr_t;
+ typedef int pthread_key_t;
+ typedef int pthread_mutex_t;
+ typedef int pthread_mutexattr_t;
+ typedef int pthread_once_t;
+ typedef int pthread_rwlock_t;
+ typedef int pthread_rwlockattr_t;
+ typedef int pthread_spinlock_t;
+#endif
 
-static int
+#define PTHREAD_COND_INITIALIZER { 0 }
+#define PTHREAD_MUTEX_INITIALIZER { 0 }
+#define PTHREAD_ONCE_INIT { 0 }
+#define PTHREAD_RWLOCK_INITIALIZER { 0 }
+
+#define PTHREAD_BARRIER_SERIAL_THREAD (-1)
+
+#define PTHREAD_CANCEL_DEFERRED 0
+#define PTHREAD_CANCEL_ASYNCHRONOUS 1
+
+#define PTHREAD_CANCEL_ENABLE 0
+#define PTHREAD_CANCEL_DISABLE 1
+
+#define PTHREAD_CANCELED ((void *) -1)
+
+#define PTHREAD_CREATE_JOINABLE 0
+#define PTHREAD_CREATE_DETACHED 1
+
+#define PTHREAD_INHERIT_SCHED 0
+#define PTHREAD_EXPLICIT_SCHED 1
+
+#define PTHREAD_MUTEX_DEFAULT PTHREAD_MUTEX_NORMAL
+#define PTHREAD_MUTEX_NORMAL 0
+#define PTHREAD_MUTEX_ERRORCHECK 1
+#define PTHREAD_MUTEX_RECURSIVE 2
+
+#define PTHREAD_MUTEX_STALLED 0
+#define PTHREAD_MUTEX_ROBUST 1
+
+#define PTHREAD_PRIO_NONE 0
+#define PTHREAD_PRIO_INHERIT 1
+#define PTHREAD_PRIO_PROTECT 2
+
+#define PTHREAD_PROCESS_PRIVATE 0
+#define PTHREAD_PROCESS_SHARED 1
+
+#define PTHREAD_SCOPE_SYSTEM 0
+#define PTHREAD_SCOPE_PROCESS 1
+
+/* Provide substitutes for the thread functions that should work
+   adequately on a single-threaded implementation, where
+   pthread_create always fails.  The goal is to let programs compile
+   on non-pthread hosts with minimal runtime overhead.
+
+   Omit interfaces that have not been analyzed and for which we do not
+   know what to do, so that they elicit a compile-time error for
+   now.  */
+
+static inline int
+pthread_cond_destroy (pthread_cond_t *cond)
+{
+  /* COND is never seriously used.  */
+  return 0;
+}
+
+static inline int
+pthread_cond_init (pthread_cond_t *restrict cond,
+                  pthread_condattr_t const *restrict attr)
+{
+  /* COND is never seriously used.  */
+  return 0;
+}
+
+static inline int
+pthread_cond_signal (pthread_cond_t *cond)
+{
+  /* No threads can currently be blocked on COND.  */
+  return 0;
+}
+
+static inline int
+pthread_cond_wait (pthread_cond_t *restrict cond,
+                  pthread_mutex_t *restrict mutex)
+{
+  /* Properly-written applications never come here.  */
+  abort ();
+  return 0;
+}
+
+static inline int
 pthread_create (pthread_t *restrict thread,
-                const pthread_attr_t *restrict attr,
-                void *(*start_routine)(void*), void *restrict arg)
+                pthread_attr_t const *restrict attr,
+                void * (*start_routine) (void*), void *restrict arg)
 {
-  errno = EAGAIN;
-  return -1;
+  /* Do not create a thread.  */
+  return EAGAIN;
 }
 
-static int
-pthread_join (pthread_t thread, void **value_ptr)
+static inline void
+pthread_exit (void *value)
 {
+  /* There is just one thread, so the process exits.  */
+  exit (0);
+}
+
+static inline int
+pthread_join (pthread_t thread, void **pvalue)
+{
+  /* Properly-written applications never come here.  */
   abort ();
-  return -1;
+  return 0;
+}
+
+static inline int
+pthread_mutex_destroy (pthread_mutex_t *mutex)
+{
+  /* MUTEX is never seriously used.  */
+  return 0;
+}
+
+static inline int
+pthread_mutex_init (pthread_mutex_t *restrict mutex,
+                   pthread_mutexattr_t const *restrict attr)
+{
+  /* MUTEX is never seriously used.  */
+  return 0;
+}
+
+static inline int
+pthread_mutex_lock (pthread_mutex_t *mutex)
+{
+  /* There is only one thread, so it always gets the lock.  This
+     implementation does not support PTHREAD_MUTEX_ERRORCHECK.  */
+  return 0;
+}
+
+static inline int
+pthread_mutex_unlock (pthread_mutex_t *mutex)
+{
+  /* There is only one thread, so it always unlocks successfully.
+     This implementation does not support robust mutexes or
+     PTHREAD_MUTEX_ERRORCHECK.  */
+  return 0;
+}
+
+static inline int
+pthread_spin_init (pthread_spinlock_t *lock, int pshared)
+{
+  /* LOCK is never seriously used.  */
+  return 0;
+}
+
+static inline int
+pthread_spin_lock (pthread_spinlock_t *lock)
+{
+  /* Only one thread, so it always gets the lock.  */
+  return 0;
+}
+
+static inline int
+pthread_spin_trylock (pthread_spinlock_t *lock)
+{
+  /* Only one thread, so it always gets the lock.  Assume that a
+     thread never tries a lock that it already holds.  */
+  return 0;
+}
+
+static inline int
+pthread_spin_unlock (pthread_spinlock_t *lock)
+{
+  /* Only one thread, so spin locks are no-ops.  */
+  return 0;
 }
 
-#endif /* PTHREAD_H_ */
+#endif /* _GL_PTHREAD_H_ */