| File: | /home/joel/rtems-4.11-work/build/rtems/c/src/../../cpukit/score/src/coresemsurrender.c |
| Location: | line 59, column 9 |
| Description: | Although the value stored to 'the_thread' is used in the enclosing expression, the value is never actually read from 'the_thread' |
| 1 | /* |
| 2 | * CORE Semaphore Handler |
| 3 | * |
| 4 | * DESCRIPTION: |
| 5 | * |
| 6 | * This package is the implementation of the CORE Semaphore Handler. |
| 7 | * This core object utilizes standard Dijkstra counting semaphores to provide |
| 8 | * synchronization and mutual exclusion capabilities. |
| 9 | * |
| 10 | * COPYRIGHT (c) 1989-1999. |
| 11 | * On-Line Applications Research Corporation (OAR). |
| 12 | * |
| 13 | * The license and distribution terms for this file may be |
| 14 | * found in the file LICENSE in this distribution or at |
| 15 | * http://www.rtems.com/license/LICENSE. |
| 16 | * |
| 17 | * $Id: coresemsurrender.c,v 1.8 2008/09/05 21:54:20 joel Exp $ |
| 18 | */ |
| 19 | |
| 20 | #if HAVE_CONFIG_H1 |
| 21 | #include "config.h" |
| 22 | #endif |
| 23 | |
| 24 | #include <rtems/system.h> |
| 25 | #include <rtems/score/isr.h> |
| 26 | #include <rtems/score/coresem.h> |
| 27 | #include <rtems/score/states.h> |
| 28 | #include <rtems/score/thread.h> |
| 29 | #include <rtems/score/threadq.h> |
| 30 | |
| 31 | /*PAGE |
| 32 | * |
| 33 | * _CORE_semaphore_Surrender |
| 34 | * |
| 35 | * Input parameters: |
| 36 | * the_semaphore - the semaphore to be flushed |
| 37 | * id - id of parent semaphore |
| 38 | * api_semaphore_mp_support - api dependent MP support actions |
| 39 | * |
| 40 | * Output parameters: |
| 41 | * CORE_SEMAPHORE_STATUS_SUCCESSFUL - if successful |
| 42 | * core error code - if unsuccessful |
| 43 | * |
| 44 | * Output parameters: |
| 45 | */ |
| 46 | |
| 47 | CORE_semaphore_Status _CORE_semaphore_Surrender( |
| 48 | CORE_semaphore_Control *the_semaphore, |
| 49 | Objects_Id id, |
| 50 | CORE_semaphore_API_mp_support_callout api_semaphore_mp_support |
| 51 | ) |
| 52 | { |
| 53 | Thread_Control *the_thread; |
| 54 | ISR_Level level; |
| 55 | CORE_semaphore_Status status; |
| 56 | |
| 57 | status = CORE_SEMAPHORE_STATUS_SUCCESSFUL; |
| 58 | |
| 59 | if ( (the_thread = _Thread_queue_Dequeue(&the_semaphore->Wait_queue)) ) { |
Although the value stored to 'the_thread' is used in the enclosing expression, the value is never actually read from 'the_thread' | |
| 60 | |
| 61 | #if defined(RTEMS_MULTIPROCESSING) |
| 62 | if ( !_Objects_Is_local_id( the_thread->Object.id ) ) |
| 63 | (*api_semaphore_mp_support) ( the_thread, id ); |
| 64 | #endif |
| 65 | |
| 66 | } else { |
| 67 | _ISR_Disable( level )do { (level) = sparc_disable_interrupts(); asm volatile("" :: : "memory"); } while (0); |
| 68 | if ( the_semaphore->count < the_semaphore->Attributes.maximum_count ) |
| 69 | the_semaphore->count += 1; |
| 70 | else |
| 71 | status = CORE_SEMAPHORE_MAXIMUM_COUNT_EXCEEDED; |
| 72 | _ISR_Enable( level )do { asm volatile("" ::: "memory"); sparc_enable_interrupts( level ); } while (0); |
| 73 | } |
| 74 | |
| 75 | return status; |
| 76 | } |