libroot: Add support for C11 threads (except gcc2).

Some programs use C11 threads instead of POSIX threads, so this change implements a light wrapper around POSIX threads that conforms to the C11 spec. This code was primarily taken from FreeBSD, with minor modifications: - The header file was trimmed to only include functions in the C11 spec, and changed to match the format of other Haiku header files - The thrd_yield function was implemented with its POSIX equivalent sched_yield instead of the non-standard pthread_yield - The thrd_create function was changed to return thrd_busy on an EAGAIN error code instead of unconditionally returning thrd_error The respective files can be found in the FreeBSD source tree at: - lib/libstdthreads/threads.h - lib/libstdthreads/thrd.c TODO: - untested (is a unit test in order?) Change-Id: I422f96f4854cd686f9637fc2e98cb03ce06a764a Reviewed-on: https://review.haiku-os.org/c/haiku/+/5213 Reviewed-by: Jérôme Duval <[email protected]> Tested-by: Commit checker robot <[email protected]>
2022-04-22 08:53:51 +00:00
parent 67077e0ca0
commit bdd35de712
4 changed files with 209 additions and 14 deletions
@@ -1,14 +0,0 @@
-/*
- * Copyright 2021 Haiku, Inc. All Rights Reserved.
- * Distributed under the terms of the MIT License.
- */
-#ifndef _STDC_PREDEF_H
-#define _STDC_PREDEF_H
-
-
-#if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L
-#  define __STDC_NO_THREADS__	1
-#endif
-
-
-#endif /* _STDC_PREDEF_H */
@@ -0,0 +1,71 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
+ * Copyright (c) 2011 Ed Schouten <[email protected]>
+ * Copyright (c) 2022 Dominic Martinez <[email protected]>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+#if __GNUC__ > 2 /* not available on gcc2 */
+
+#ifndef _THREADS_H_
+#define _THREADS_H_
+
+#include <sys/types.h>
+#include <time.h>
+
+typedef pthread_t thrd_t;
+typedef int (*thrd_start_t)(void *);
+
+enum {
+	thrd_busy = 1,
+	thrd_error = 2,
+	thrd_nomem = 3,
+	thrd_success = 4,
+	thrd_timedout = 5
+};
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+int	thrd_create(thrd_t *thread, thrd_start_t, void *);
+thrd_t	thrd_current(void);
+int	thrd_detach(thrd_t);
+int	thrd_equal(thrd_t, thrd_t);
+_Noreturn void
+	thrd_exit(int);
+int	thrd_join(thrd_t, int *);
+int	thrd_sleep(const struct timespec *, struct timespec *);
+void	thrd_yield(void);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _THREADS_H_ */
+
+#endif /* __GNUC__ > 2 */