fts: add #if guards so that the fts_lgpl module still builds

[gnulib.git] / lib / glthread / thread.h

diff --git a/lib/glthread/thread.h b/lib/glthread/thread.h
index 5c98cdd..a5f62a1 100644 (file)
--- a/lib/glthread/thread.h
+++ b/lib/glthread/thread.h
@@ -137,6 +137,9 @@ extern int glthread_in_use (void);
 
 /* -------------------------- gl_thread_t datatype -------------------------- */
 
+/* This choice of gl_thread_t assumes that
+     pthread_equal (a, b)  is equivalent to  ((a) == (b)).
+   This is the case on all platforms in use in 2008.  */
 typedef pthread_t gl_thread_t;
 # define glthread_create(THREADP, FUNC, ARG) \
     (pthread_in_use () ? pthread_create (THREADP, NULL, FUNC, ARG) : ENOSYS)
@@ -250,13 +253,13 @@ typedef thread_t gl_thread_t;
 # define glthread_create(THREADP, FUNC, ARG) \
     (thread_in_use () ? thr_create (NULL, 0, FUNC, ARG, 0, THREADP) : 0)
 # define glthread_sigmask(HOW, SET, OSET) \
-    (pthread_in_use () ? sigprocmask (HOW, SET, OSET) : 0)
+    (thread_in_use () ? sigprocmask (HOW, SET, OSET) : 0)
 # define glthread_join(THREAD, RETVALP) \
-    (pthread_in_use () ? thr_join (THREAD, NULL, RETVALP) : 0)
+    (thread_in_use () ? thr_join (THREAD, NULL, RETVALP) : 0)
 # define gl_thread_self() \
-    (pthread_in_use () ? (void *) thr_self () : 0)
+    (thread_in_use () ? (void *) thr_self () : 0)
 # define gl_thread_exit(RETVAL) \
-    (pthread_in_use () ? thr_exit (RETVAL) : 0)
+    (thread_in_use () ? thr_exit (RETVAL) : 0)
 # define glthread_atfork(PREPARE_FUNC, PARENT_FUNC, CHILD_FUNC) 0
 
 # ifdef __cplusplus
@@ -267,6 +270,50 @@ typedef thread_t gl_thread_t;
 
 /* ========================================================================= */
 
+#if USE_WIN32_THREADS
+
+# include <windows.h>
+
+# ifdef __cplusplus
+extern "C" {
+# endif
+
+/* -------------------------- gl_thread_t datatype -------------------------- */
+
+/* The gl_thread_t is a pointer to a structure in memory.
+   Why not the thread handle?  If it were the thread handle, it would be hard
+   to implement gl_thread_self() (since GetCurrentThread () returns a pseudo-
+   handle, DuplicateHandle (GetCurrentThread ()) returns a handle that must be
+   closed afterwards, and there is no function for quickly retrieving a thread
+   handle from its id).
+   Why not the thread id?  I tried it.  It did not work: Sometimes ids appeared
+   that did not belong to running threads, and glthread_join failed with ESRCH.
+ */
+typedef struct gl_thread_struct *gl_thread_t;
+# define glthread_create(THREADP, FUNC, ARG) \
+    glthread_create_func (THREADP, FUNC, ARG)
+# define glthread_sigmask(HOW, SET, OSET) \
+    /* unsupported */ 0
+# define glthread_join(THREAD, RETVALP) \
+    glthread_join_func (THREAD, RETVALP)
+# define gl_thread_self() \
+    gl_thread_self_func ()
+# define gl_thread_exit(RETVAL) \
+    gl_thread_exit_func (RETVAL)
+# define glthread_atfork(PREPARE_FUNC, PARENT_FUNC, CHILD_FUNC) 0
+extern int glthread_create_func (gl_thread_t *threadp, void * (*func) (void *), void *arg);
+extern int glthread_join_func (gl_thread_t thread, void **retvalp);
+extern gl_thread_t gl_thread_self_func (void);
+extern int gl_thread_exit_func (void *retval);
+
+# ifdef __cplusplus
+}
+# endif
+
+#endif
+
+/* ========================================================================= */
+
 #if !(USE_POSIX_THREADS || USE_PTH_THREADS || USE_SOLARIS_THREADS || USE_WIN32_THREADS)
 
 /* Provide dummy implementation if threads are not supported.  */