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-rw-r--r--lib/glthread/threadlib.c108
1 files changed, 108 insertions, 0 deletions
diff --git a/lib/glthread/threadlib.c b/lib/glthread/threadlib.c
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+/* Multithreading primitives.
+ Copyright (C) 2005-2022 Free Software Foundation, Inc.
+
+ This file is free software: you can redistribute it and/or modify
+ it under the terms of the GNU Lesser General Public License as
+ published by the Free Software Foundation; either version 2.1 of the
+ License, or (at your option) any later version.
+
+ This file is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with this program. If not, see <https://www.gnu.org/licenses/>. */
+
+/* Written by Bruno Haible <bruno@clisp.org>, 2005. */
+
+#include <config.h>
+
+/* ========================================================================= */
+
+#if USE_POSIX_THREADS || USE_ISOC_AND_POSIX_THREADS
+
+/* Use the POSIX threads library. */
+
+# include <errno.h>
+# include <pthread.h>
+# include <stdlib.h>
+
+# if PTHREAD_IN_USE_DETECTION_HARD
+
+# if defined __FreeBSD__ || defined __DragonFly__ /* FreeBSD */
+
+/* Test using pthread_key_create. */
+
+int
+glthread_in_use (void)
+{
+ static int tested;
+ static int result; /* 1: linked with -lpthread, 0: only with libc */
+
+ if (!tested)
+ {
+ pthread_key_t key;
+ int err = pthread_key_create (&key, NULL);
+
+ if (err == ENOSYS)
+ result = 0;
+ else
+ {
+ result = 1;
+ if (err == 0)
+ pthread_key_delete (key);
+ }
+ tested = 1;
+ }
+ return result;
+}
+
+# else /* Solaris, HP-UX */
+
+/* Test using pthread_create. */
+
+/* The function to be executed by a dummy thread. */
+static void *
+dummy_thread_func (void *arg)
+{
+ return arg;
+}
+
+int
+glthread_in_use (void)
+{
+ static int tested;
+ static int result; /* 1: linked with -lpthread, 0: only with libc */
+
+ if (!tested)
+ {
+ pthread_t thread;
+
+ if (pthread_create (&thread, NULL, dummy_thread_func, NULL) != 0)
+ /* Thread creation failed. */
+ result = 0;
+ else
+ {
+ /* Thread creation works. */
+ void *retval;
+ if (pthread_join (thread, &retval) != 0)
+ abort ();
+ result = 1;
+ }
+ tested = 1;
+ }
+ return result;
+}
+
+# endif
+
+# endif
+
+#endif
+
+/* ========================================================================= */
+
+/* This declaration is solely to ensure that after preprocessing
+ this file is never empty. */
+typedef int dummy;