Cygwin: Add C11 threads API

Code taken from FreeBSD, which implements C11 threads as
wrapper around pthreads.  Fix up machine/_threads.h which
is called from newlib's machine-independent threads.h to
match Cygwin's pthreads types.

Add the FreeBSD source files to libc subdir and take
opportunity to define LIBC_OFILES var in Makefile.

Add new symbols to common.din and sort symbols.

Signed-off-by: Corinna Vinschen <corinna@vinschen.de>

5 files changed, 494 insertions, 0 deletions

diff --git a/winsup/cygwin/libc/call_once.c b/winsup/cygwin/libc/call_once.c
new file mode 100644
index 000000000..bb8618ce2
--- /dev/null
+++ b/winsup/cygwin/libc/call_once.c
@@ -0,0 +1,46 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
+ * Copyright (c) 2011 Ed Schouten <ed@FreeBSD.org>
+ * 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.
+ *
+ * $FreeBSD$
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <pthread.h>
+
+#include "threads.h"
+
+void
+call_once(once_flag *flag, void (*func)(void))
+{
+
+	(void)pthread_once((pthread_once_t *)flag, func);
+}
+
+_Static_assert(sizeof(once_flag) == sizeof(pthread_once_t),
+    "once_flag must be of the same size as pthread_once_t");
diff --git a/winsup/cygwin/libc/cnd.c b/winsup/cygwin/libc/cnd.c
new file mode 100644
index 000000000..a27d55d72
--- /dev/null
+++ b/winsup/cygwin/libc/cnd.c
@@ -0,0 +1,100 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
+ * Copyright (c) 2011 Ed Schouten <ed@FreeBSD.org>
+ * 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.
+ *
+ * $FreeBSD$
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <errno.h>
+#include <pthread.h>
+
+#include "threads.h"
+
+int
+cnd_broadcast(cnd_t *cond)
+{
+
+	if (pthread_cond_broadcast(cond) != 0)
+		return (thrd_error);
+	return (thrd_success);
+}
+
+void
+cnd_destroy(cnd_t *cond)
+{
+
+	(void)pthread_cond_destroy(cond);
+}
+
+int
+cnd_init(cnd_t *cond)
+{
+
+	switch (pthread_cond_init(cond, NULL)) {
+	case 0:
+		return (thrd_success);
+	case ENOMEM:
+		return (thrd_nomem);
+	default:
+		return (thrd_error);
+	}
+}
+
+int
+cnd_signal(cnd_t *cond)
+{
+
+	if (pthread_cond_signal(cond) != 0)
+		return (thrd_error);
+	return (thrd_success);
+}
+
+int
+cnd_timedwait(cnd_t *restrict cond, mtx_t *restrict mtx,
+    const struct timespec *restrict ts)
+{
+
+	switch (pthread_cond_timedwait(cond, mtx, ts)) {
+	case 0:
+		return (thrd_success);
+	case ETIMEDOUT:
+		return (thrd_timedout);
+	default:
+		return (thrd_error);
+	}
+}
+
+int
+cnd_wait(cnd_t *cond, mtx_t *mtx)
+{
+
+	if (pthread_cond_wait(cond, mtx) != 0)
+		return (thrd_error);
+	return (thrd_success);
+}
diff --git a/winsup/cygwin/libc/mtx.c b/winsup/cygwin/libc/mtx.c
new file mode 100644
index 000000000..dca0849cc
--- /dev/null
+++ b/winsup/cygwin/libc/mtx.c
@@ -0,0 +1,125 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
+ * Copyright (c) 2011 Ed Schouten <ed@FreeBSD.org>
+ * 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.
+ *
+ * $FreeBSD$
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <errno.h>
+#include <pthread.h>
+
+#include "threads.h"
+
+void
+mtx_destroy(mtx_t *mtx)
+{
+
+	(void)pthread_mutex_destroy(mtx);
+}
+
+int
+mtx_init(mtx_t *mtx, int type)
+{
+	pthread_mutexattr_t attr;
+	int mt;
+
+	switch (type) {
+	case mtx_plain:
+	case mtx_timed:
+		mt = PTHREAD_MUTEX_NORMAL;
+		break;
+#ifdef __CYGWIN__
+	/* This is a hack to support apps running under GLibc.  mtx_plain is
+	   defined as 0 in GLibc, so apps calling mtx_init with just the
+	   mtx_recursive flag don't fail, as they should.  Rather they run
+	   as if mtx_plain | mtx_recursive has been given as type. */
+	case mtx_recursive:
+#endif
+	case mtx_plain | mtx_recursive:
+	case mtx_timed | mtx_recursive:
+		mt = PTHREAD_MUTEX_RECURSIVE;
+		break;
+	default:
+		return (thrd_error);
+	}
+
+	if (pthread_mutexattr_init(&attr) != 0)
+		return (thrd_error);
+	if (pthread_mutexattr_settype(&attr, mt) != 0)
+		return (thrd_error);
+	if (pthread_mutex_init(mtx, &attr) != 0)
+		return (thrd_error);
+	return (thrd_success);
+}
+
+int
+mtx_lock(mtx_t *mtx)
+{
+
+	if (pthread_mutex_lock(mtx) != 0)
+		return (thrd_error);
+	return (thrd_success);
+}
+
+int
+mtx_timedlock(mtx_t *restrict mtx, const struct timespec *restrict ts)
+{
+
+	switch (pthread_mutex_timedlock(mtx, ts)) {
+	case 0:
+		return (thrd_success);
+	case ETIMEDOUT:
+		return (thrd_timedout);
+	default:
+		return (thrd_error);
+	}
+}
+
+int
+mtx_trylock(mtx_t *mtx)
+{
+
+	switch (pthread_mutex_trylock(mtx)) {
+	case 0:
+		return (thrd_success);
+	case EBUSY:
+		return (thrd_busy);
+	default:
+		return (thrd_error);
+	}
+}
+
+int
+mtx_unlock(mtx_t *mtx)
+{
+
+	if (pthread_mutex_unlock(mtx) != 0)
+		return (thrd_error);
+	return (thrd_success);
+}
diff --git a/winsup/cygwin/libc/thrd.c b/winsup/cygwin/libc/thrd.c
new file mode 100644
index 000000000..fc79f66ca
--- /dev/null
+++ b/winsup/cygwin/libc/thrd.c
@@ -0,0 +1,150 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
+ * Copyright (c) 2011 Ed Schouten <ed@FreeBSD.org>
+ * 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.
+ *
+ * $FreeBSD$
+ */
+
+#ifdef __CYGWIN__
+#include <errno.h>
+#endif
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <pthread.h>
+#include <stdint.h>
+#include <stdlib.h>
+
+#include "threads.h"
+
+struct thrd_param {
+	thrd_start_t	 func;
+	void		*arg;
+};
+
+static void *
+thrd_entry(void *arg)
+{
+	struct thrd_param tp;
+
+	tp = *(struct thrd_param *)arg;
+	free(arg);
+	return ((void *)(intptr_t)tp.func(tp.arg));
+}
+
+int
+thrd_create(thrd_t *thr, thrd_start_t func, void *arg)
+{
+	struct thrd_param *tp;
+
+	/*
+	 * Work around return type inconsistency.  Wrap execution using
+	 * a function conforming to pthread_create()'s start_routine.
+	 */
+	tp = malloc(sizeof(*tp));
+	if (tp == NULL)
+		return (thrd_nomem);
+	tp->func = func;
+	tp->arg = arg;
+	if (pthread_create(thr, NULL, thrd_entry, tp) != 0) {
+		free(tp);
+		return (thrd_error);
+	}
+	return (thrd_success);
+}
+
+thrd_t
+thrd_current(void)
+{
+
+	return (pthread_self());
+}
+
+int
+thrd_detach(thrd_t thr)
+{
+
+	if (pthread_detach(thr) != 0)
+		return (thrd_error);
+	return (thrd_success);
+}
+
+int
+thrd_equal(thrd_t thr0, thrd_t thr1)
+{
+
+	return (pthread_equal(thr0, thr1));
+}
+
+_Noreturn void
+thrd_exit(int res)
+{
+
+	pthread_exit((void *)(intptr_t)res);
+}
+
+int
+thrd_join(thrd_t thr, int *res)
+{
+	void *value_ptr;
+
+	if (pthread_join(thr, &value_ptr) != 0)
+		return (thrd_error);
+	if (res != NULL)
+		*res = (intptr_t)value_ptr;
+	return (thrd_success);
+}
+
+int
+thrd_sleep(const struct timespec *duration, struct timespec *remaining)
+{
+#ifdef __CYGWIN__
+	/* Return value per POSIX:
+	    0 on successful sleep,
+	   -1 if a signal occurred,
+	   other negative value if an error occurred. */
+	int ret = clock_nanosleep(CLOCK_REALTIME, 0, duration, remaining);
+	switch (ret) {
+	case 0:
+		return 0;
+	case EINTR:
+		return -1;
+	default:
+		return -ret;	/* EPERM isn't generated by clock_nanosleep
+				   so this is safe. */
+	}
+#else
+	int ret = nanosleep(duration, remaining);
+#endif
+}
+
+void
+thrd_yield(void)
+{
+
+	pthread_yield();
+}
diff --git a/winsup/cygwin/libc/tss.c b/winsup/cygwin/libc/tss.c
new file mode 100644
index 000000000..9f15b3365
--- /dev/null
+++ b/winsup/cygwin/libc/tss.c
@@ -0,0 +1,73 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
+ * Copyright (c) 2011 Ed Schouten <ed@FreeBSD.org>
+ * 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.
+ *
+ * $FreeBSD$
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#ifdef __CYGWIN__
+#include <limits.h>
+#endif
+#include <pthread.h>
+
+#include "threads.h"
+
+int
+tss_create(tss_t *key, tss_dtor_t dtor)
+{
+	if (pthread_key_create(key, dtor) != 0)
+		return (thrd_error);
+	return (thrd_success);
+}
+
+void
+tss_delete(tss_t key)
+{
+
+	(void)pthread_key_delete(key);
+}
+
+void *
+tss_get(tss_t key)
+{
+
+	return (pthread_getspecific(key));
+}
+
+int
+tss_set(tss_t key, void *val)
+{
+
+	if (pthread_setspecific(key, val) != 0)
+		return (thrd_error);
+	return (thrd_success);
+}
+
+_Static_assert(TSS_DTOR_ITERATIONS == PTHREAD_DESTRUCTOR_ITERATIONS,
+    "TSS_DTOR_ITERATIONS must be identical to PTHREAD_DESTRUCTOR_ITERATIONS");