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Diffstat (limited to 'os/kernel/include/chsem.h')
-rw-r--r-- | os/kernel/include/chsem.h | 104 |
1 files changed, 104 insertions, 0 deletions
diff --git a/os/kernel/include/chsem.h b/os/kernel/include/chsem.h new file mode 100644 index 000000000..cced49601 --- /dev/null +++ b/os/kernel/include/chsem.h @@ -0,0 +1,104 @@ +/*
+ ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010 Giovanni Di Sirio.
+
+ This file is part of ChibiOS/RT.
+
+ ChibiOS/RT is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
+
+ ChibiOS/RT 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 General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+/**
+ * @file semaphores.h
+ * @brief Semaphores macros and structures.
+ *
+ * @addtogroup semaphores
+ * @{
+ */
+
+#ifndef _SEMAPHORES_H_
+#define _SEMAPHORES_H_
+
+#if CH_USE_SEMAPHORES
+
+/**
+ * @brief Semaphore structure.
+ */
+typedef struct Semaphore {
+ ThreadsQueue s_queue; /**< @brief Queue of the threads sleeping
+ on this semaphore. */
+ cnt_t s_cnt; /**< @brief The semaphore counter. */
+} Semaphore;
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+ void chSemInit(Semaphore *sp, cnt_t n);
+ void chSemReset(Semaphore *sp, cnt_t n);
+ void chSemResetI(Semaphore *sp, cnt_t n);
+ msg_t chSemWait(Semaphore *sp);
+ msg_t chSemWaitS(Semaphore *sp);
+ msg_t chSemWaitTimeout(Semaphore *sp, systime_t time);
+ msg_t chSemWaitTimeoutS(Semaphore *sp, systime_t time);
+ void chSemSignal(Semaphore *sp);
+ void chSemSignalI(Semaphore *sp);
+#if CH_USE_SEMSW
+ msg_t chSemSignalWait(Semaphore *sps, Semaphore *spw);
+#endif
+#ifdef __cplusplus
+}
+#endif
+
+/**
+ * @brief Data part of a static semaphore initializer.
+ * @details This macro should be used when statically initializing a semaphore
+ * that is part of a bigger structure.
+ *
+ * @param[in] name the name of the semaphore variable
+ * @param[in] n the counter initial value, this value must be
+ * non-negative
+ */
+#define _SEMAPHORE_DATA(name, n) {_THREADSQUEUE_DATA(name.s_queue), n}
+
+/**
+ * @brief Static semaphore initializer.
+ * @details Statically initialized semaphores require no explicit
+ * initialization using @p chSemInit().
+ *
+ * @param[in] name the name of the semaphore variable
+ * @param[in] n the counter initial value, this value must be
+ * non-negative
+ */
+#define SEMAPHORE_DECL(name, n) Semaphore name = _SEMAPHORE_DATA(name, n)
+
+/**
+ * @brief Decreases the semaphore counter.
+ * @details This macro can be used when the counter is known to be positive.
+ */
+#define chSemFastWaitI(sp) ((sp)->s_cnt--)
+
+/**
+ * @brief Increases the semaphore counter.
+ * @details This macro can be used when the counter is known to be not negative.
+ */
+#define chSemFastSignalI(sp) ((sp)->s_cnt++)
+
+/**
+ * @brief Returns the semaphore counter current value.
+ */
+#define chSemGetCounterI(sp) ((sp)->s_cnt)
+
+#endif /* CH_USE_SEMAPHORES */
+
+#endif /* _SEMAPHORES_H_ */
+
+/** @} */
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