| File: | /home/joel/rtems-4.11-work/build/rtems/c/src/../../cpukit/score/src/threadstackallocate.c |
| Location: | line 50, column 10 |
| Description: | Value stored to 'the_stack_size' during its initialization is never read |
| 1 | /* |
| 2 | * Thread Handler |
| 3 | * |
| 4 | * |
| 5 | * COPYRIGHT (c) 1989-2008. |
| 6 | * On-Line Applications Research Corporation (OAR). |
| 7 | * |
| 8 | * The license and distribution terms for this file may be |
| 9 | * found in found in the file LICENSE in this distribution or at |
| 10 | * http://www.rtems.com/license/LICENSE. |
| 11 | * |
| 12 | * $Id: threadstackallocate.c,v 1.12 2008/12/15 19:21:01 joel Exp $ |
| 13 | */ |
| 14 | |
| 15 | #if HAVE_CONFIG_H1 |
| 16 | #include "config.h" |
| 17 | #endif |
| 18 | |
| 19 | #include <rtems/system.h> |
| 20 | #include <rtems/score/apiext.h> |
| 21 | #include <rtems/score/context.h> |
| 22 | #include <rtems/score/interr.h> |
| 23 | #include <rtems/score/isr.h> |
| 24 | #include <rtems/score/object.h> |
| 25 | #include <rtems/score/priority.h> |
| 26 | #include <rtems/score/states.h> |
| 27 | #include <rtems/score/sysstate.h> |
| 28 | #include <rtems/score/thread.h> |
| 29 | #include <rtems/score/threadq.h> |
| 30 | #include <rtems/score/userext.h> |
| 31 | #include <rtems/score/wkspace.h> |
| 32 | #include <rtems/config.h> |
| 33 | |
| 34 | /*PAGE |
| 35 | * |
| 36 | * _Thread_Stack_Allocate |
| 37 | * |
| 38 | * Allocate the requested stack space for the thread. |
| 39 | * return the actual size allocated after any adjustment |
| 40 | * or return zero if the allocation failed. |
| 41 | * Set the Start.stack field to the address of the stack |
| 42 | */ |
| 43 | |
| 44 | size_t _Thread_Stack_Allocate( |
| 45 | Thread_Control *the_thread, |
| 46 | size_t stack_size |
| 47 | ) |
| 48 | { |
| 49 | void *stack_addr = 0; |
| 50 | size_t the_stack_size = stack_size; |
Value stored to 'the_stack_size' during its initialization is never read | |
| 51 | |
| 52 | the_stack_size = _Stack_Ensure_minimum( stack_size ); |
| 53 | |
| 54 | /* |
| 55 | * Call ONLY the CPU table stack allocate hook, _or_ the |
| 56 | * the RTEMS workspace allocate. This is so the stack free |
| 57 | * routine can call the correct deallocation routine. |
| 58 | */ |
| 59 | |
| 60 | if ( Configuration.stack_allocate_hook ) { |
| 61 | stack_addr = (*Configuration.stack_allocate_hook)( the_stack_size ); |
| 62 | } else { |
| 63 | |
| 64 | /* |
| 65 | * First pad the requested size so we allocate enough memory |
| 66 | * so the context initialization can align it properly. The address |
| 67 | * returned the workspace allocate must be directly stored in the |
| 68 | * stack control block because it is later used in the free sequence. |
| 69 | * |
| 70 | * Thus it is the responsibility of the CPU dependent code to |
| 71 | * get and keep the stack adjust factor, the stack alignment, and |
| 72 | * the context initialization sequence in sync. |
| 73 | */ |
| 74 | |
| 75 | the_stack_size = _Stack_Adjust_size( the_stack_size ); |
| 76 | stack_addr = _Workspace_Allocate( the_stack_size ); |
| 77 | } |
| 78 | |
| 79 | if ( !stack_addr ) |
| 80 | the_stack_size = 0; |
| 81 | |
| 82 | the_thread->Start.stack = stack_addr; |
| 83 | |
| 84 | return the_stack_size; |
| 85 | } |