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[/] [openrisc/] [trunk/] [rtos/] [rtems/] [c/] [src/] [exec/] [score/] [src/] [coremutex.c] - Rev 227
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/* * Mutex Handler * * DESCRIPTION: * * This package is the implementation of the Mutex Handler. * This handler provides synchronization and mutual exclusion capabilities. * * 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: coremutex.c,v 1.2 2001-09-27 11:59:34 chris Exp $ */ #include <rtems/system.h> #include <rtems/score/isr.h> #include <rtems/score/coremutex.h> #include <rtems/score/states.h> #include <rtems/score/thread.h> #include <rtems/score/threadq.h> /*PAGE * * _CORE_mutex_Initialize * * This routine initializes a mutex at create time and set the control * structure according to the values passed. * * Input parameters: * the_mutex - the mutex control block to initialize * the_class - the API class of the object * the_mutex_attributes - the mutex attributes specified at create time * initial_lock - mutex initial lock or unlocked status * proxy_extract_callout - MP specific extract callout * * Output parameters: NONE */ void _CORE_mutex_Initialize( CORE_mutex_Control *the_mutex, Objects_Classes the_class, CORE_mutex_Attributes *the_mutex_attributes, unsigned32 initial_lock, Thread_queue_Extract_callout proxy_extract_callout ) { /* Add this to the RTEMS environment later ????????? rtems_assert( initial_lock == CORE_MUTEX_LOCKED || initial_lock == CORE_MUTEX_UNLOCKED ); */ the_mutex->Attributes = *the_mutex_attributes; the_mutex->lock = initial_lock; #if 0 if ( !the_mutex_attributes->only_owner_release && the_mutex_attributes->nesting_allowed ) { _Internal_error_Occurred( INTERNAL_ERROR_CORE, TRUE, INTERNAL_ERROR_BAD_ATTRIBUTES ); } #endif if ( initial_lock == CORE_MUTEX_LOCKED ) { the_mutex->nest_count = 1; the_mutex->holder = _Thread_Executing; the_mutex->holder_id = _Thread_Executing->Object.id; _Thread_Executing->resource_count++; } else { the_mutex->nest_count = 0; the_mutex->holder = NULL; the_mutex->holder_id = 0; } _Thread_queue_Initialize( &the_mutex->Wait_queue, the_class, _CORE_mutex_Is_fifo( the_mutex_attributes ) ? THREAD_QUEUE_DISCIPLINE_FIFO : THREAD_QUEUE_DISCIPLINE_PRIORITY, STATES_WAITING_FOR_MUTEX, proxy_extract_callout, CORE_MUTEX_TIMEOUT ); }
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