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authorJason Evans <jasone@FreeBSD.org>2001-08-14 22:13:14 +0000
committerJason Evans <jasone@FreeBSD.org>2001-08-14 22:13:14 +0000
commit54db32e945d6413aeddd438d91dfcbd6eea60b4c (patch)
treed91dfc6ae29c51ee7b7772f5c65594da7b86a388 /sys/sys/sema.h
parentee755665c268aa5b22d7c4fd40dc02dfac64bfab (diff)
downloadsrc-54db32e945d6413aeddd438d91dfcbd6eea60b4c.tar.gz
src-54db32e945d6413aeddd438d91dfcbd6eea60b4c.zip
Implement kernel semaphores.
Reviewed by: jhb
Notes
Notes: svn path=/head/; revision=81645
Diffstat (limited to 'sys/sys/sema.h')
-rw-r--r--sys/sys/sema.h60
1 files changed, 60 insertions, 0 deletions
diff --git a/sys/sys/sema.h b/sys/sys/sema.h
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+/*
+ * Copyright (C) 2001 Jason Evans <jasone@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(s), this list of conditions and the following disclaimer as
+ * the first lines of this file unmodified other than the possible
+ * addition of one or more copyright notices.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice(s), 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 COPYRIGHT HOLDER(S) ``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 COPYRIGHT HOLDER(S) 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.
+ *
+ * $FreeBSD$
+ */
+
+#ifndef _SYS_SEMA_H_
+#define _SYS_SEMA_H_
+
+#include <sys/_mutex.h>
+#include <sys/condvar.h>
+
+struct sema {
+ struct mtx sema_mtx; /* General protection lock. */
+ struct cv sema_cv; /* Waiters. */
+ int sema_waiters; /* Number of waiters. */
+ int sema_value; /* Semaphore value. */
+};
+
+#ifdef _KERNEL
+void sema_init(struct sema *sema, int value, const char *description);
+void sema_destroy(struct sema *sema);
+void _sema_post(struct sema *sema, const char *file, int line);
+void _sema_wait(struct sema *sema, const char *file, int line);
+int _sema_timedwait(struct sema *sema, int timo, const char *file, int
+ line);
+int _sema_trywait(struct sema *sema, const char *file, int line);
+int sema_value(struct sema *sema);
+
+#define sema_post(sema) _sema_post((sema), __FILE__, __LINE__)
+#define sema_wait(sema) _sema_wait((sema), __FILE__, __LINE__)
+#define sema_timedwait(sema, timo) \
+ _sema_timedwait((sema), (timo), __FILE__, __LINE__)
+#define sema_trywait(sema) _sema_trywait((sema), __FILE__, __LINE__)
+
+#endif /* _KERNEL */
+#endif /* _SYS_SEMA_H_ */