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[/] [openrisc/] [trunk/] [rtos/] [rtems/] [c/] [src/] [exec/] [rtems/] [include/] [rtems/] [rtems/] [sem.h] - Rev 30
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/* semaphore.h * * This include file contains all the constants and structures associated * with the Semaphore Manager. This manager utilizes standard Dijkstra * counting semaphores to provide synchronization and mutual exclusion * capabilities. * * Directives provided are: * * + create a semaphore * + get an ID of a semaphore * + delete a semaphore * + acquire a semaphore * + release a semaphore * * COPYRIGHT (c) 1989-1999. * On-Line Applications Research Corporation (OAR). * * The license and distribution terms for this file may be * found in the file LICENSE in this distribution or at * http://www.OARcorp.com/rtems/license.html. * * $Id: sem.h,v 1.2 2001-09-27 11:59:18 chris Exp $ */ #ifndef __RTEMS_SEMAPHORE_h #define __RTEMS_SEMAPHORE_h #ifdef __cplusplus extern "C" { #endif #include <rtems/rtems/types.h> #include <rtems/rtems/support.h> #include <rtems/rtems/tasks.h> #include <rtems/rtems/attr.h> #include <rtems/score/coremutex.h> #include <rtems/score/object.h> #include <rtems/score/coresem.h> #include <rtems/score/threadq.h> /* * The following defines the control block used to manage each semaphore. */ typedef struct { Objects_Control Object; rtems_attribute attribute_set; union { CORE_mutex_Control mutex; CORE_semaphore_Control semaphore; } Core_control; } Semaphore_Control; /* * The following defines the information control block used to manage * this class of objects. */ RTEMS_EXTERN Objects_Information _Semaphore_Information; /* * _Semaphore_Manager_initialization * * DESCRIPTION: * * This routine performs the initialization necessary for this manager. */ void _Semaphore_Manager_initialization( unsigned32 maximum_semaphores ); /* * rtems_semaphore_create * * DESCRIPTION: * * This routine implements the rtems_semaphore_create directive. The * semaphore will have the name name. The starting count for * the semaphore is count. The attribute_set determines if * the semaphore is global or local and the thread queue * discipline. It returns the id of the created semaphore in ID. */ rtems_status_code rtems_semaphore_create( rtems_name name, unsigned32 count, rtems_attribute attribute_set, rtems_task_priority priority_ceiling, rtems_id *id ); /* * rtems_semaphore_ident * * DESCRIPTION: * * This routine implements the rtems_semaphore_ident directive. * This directive returns the semaphore ID associated with name. * If more than one semaphore is named name, then the semaphore * to which the ID belongs is arbitrary. node indicates the * extent of the search for the ID of the semaphore named name. * The search can be limited to a particular node or allowed to * encompass all nodes. */ rtems_status_code rtems_semaphore_ident( rtems_name name, unsigned32 node, rtems_id *id ); /* * rtems_semaphore_delete * * DESCRIPTION: * * This routine implements the rtems_semaphore_delete directive. The * semaphore indicated by ID is deleted. */ rtems_status_code rtems_semaphore_delete( rtems_id id ); /* * rtems_semaphore_obtain * * DESCRIPTION: * * This routine implements the rtems_semaphore_obtain directive. It * attempts to obtain a unit from the semaphore associated with ID. * If a unit can be allocated, the calling task will return immediately. * If no unit is available, then the task may return immediately or * block waiting for a unit with an optional timeout of timeout * clock ticks. Whether the task blocks or returns immediately * is based on the RTEMS_NO_WAIT option in the option_set. */ rtems_status_code rtems_semaphore_obtain( rtems_id id, unsigned32 option_set, rtems_interval timeout ); /* * rtems_semaphore_release * * DESCRIPTION: * * This routine implements the rtems_semaphore_release directive. It * frees a unit to the semaphore associated with ID. If a task was * blocked waiting for a unit from this semaphore, then that task will * be readied and the unit given to that task. Otherwise, the unit * will be returned to the semaphore. */ rtems_status_code rtems_semaphore_release( rtems_id id ); /* * rtems_semaphore_flush * * This directive allows a thread to flush the threads * pending on the semaphore. */ rtems_status_code rtems_semaphore_flush( Objects_Id id ); /* * _Semaphore_Seize * * DESCRIPTION: * * This routine attempts to receive a unit from the_semaphore. * If a unit is available or if the RTEMS_NO_WAIT option is enabled in * option_set, then the routine returns. Otherwise, the calling task * is blocked until a unit becomes available. */ boolean _Semaphore_Seize( Semaphore_Control *the_semaphore, unsigned32 option_set ); /* * _Semaphore_Translate_core_mutex_return_code * * DESCRIPTION: * * This function returns a RTEMS status code based on the mutex * status code specified. */ rtems_status_code _Semaphore_Translate_core_mutex_return_code ( unsigned32 the_mutex_status ); /* * _Semaphore_Translate_core_semaphore_return_code * * DESCRIPTION: * * This function returns a RTEMS status code based on the semaphore * status code specified. */ rtems_status_code _Semaphore_Translate_core_semaphore_return_code ( unsigned32 the_mutex_status ); /*PAGE * * _Semaphore_Core_mutex_mp_support * * DESCRIPTION: * * This function processes the global actions necessary for remote * accesses to a global semaphore based on a core mutex. This function * is called by the core. */ #if defined(RTEMS_MULTIPROCESSING) void _Semaphore_Core_mutex_mp_support ( Thread_Control *the_thread, rtems_id id ); #endif /*PAGE * * _Semaphore_Core_mp_support * * DESCRIPTION: * * This function processes the global actions necessary for remote * accesses to a global semaphore based on a core semaphore. This function * is called by the core. */ void _Semaphore_Core_semaphore_mp_support ( Thread_Control *the_thread, rtems_id id ); /*PAGE * * _POSIX_Semaphore_MP_support * * DESCRIPTION: * * XXX */ void _POSIX_Semaphore_MP_support( Thread_Control *the_thread, Objects_Id id ); #ifndef __RTEMS_APPLICATION__ #include <rtems/rtems/sem.inl> #endif #if defined(RTEMS_MULTIPROCESSING) #include <rtems/rtems/semmp.h> #endif #ifdef __cplusplus } #endif #endif /* end of include file */
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