author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Tue, 31 Aug 2010 16:54:36 +0300 | |
branch | RCL_3 |
changeset 56 | acd3cd4aaceb |
parent 0 | e4d67989cc36 |
permissions | -rw-r--r-- |
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// Copyright (c) 2005-2009 Nokia Corporation and/or its subsidiary(-ies). |
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// All rights reserved. |
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// This component and the accompanying materials are made available |
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// under the terms of "Eclipse Public License v1.0" |
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// which accompanies this distribution, and is available |
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// at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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// |
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// Initial Contributors: |
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// Nokia Corporation - initial contribution. |
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// |
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// Contributors: |
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// |
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// Description: |
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// Name : setpriority.cpp |
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// Part of : LIBC |
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// Contains the source for fchdir |
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// Version : 1.0 |
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// |
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#include <sys/time.h> |
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#include <sys/resource.h> |
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#include <errno.h> |
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#include <e32std.h> |
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#include <e32const.h> |
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#if (defined(__SYMBIAN32__) && (defined(__WINSCW__) || defined(__WINS__))) |
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#include "libc_wsd_defs.h" |
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#endif |
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#ifdef EMULATOR |
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int *GET_WSD_VAR_NAME(ProcPriority, g)(); |
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#define ProcPriority (*GET_WSD_VAR_NAME(ProcPriority, g)()) |
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#else |
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extern int ProcPriority; |
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#endif //EMULATOR |
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/* |
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This function checks where in the priority range the parameter falls |
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and sets the priority accordingly. |
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It returns -1 if the paramter is out of range. |
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*/ |
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TProcessPriority convPri( int pri) |
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{ |
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TProcessPriority priority = TProcessPriority(-1); |
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if((pri >= UPPER_LIMIT_PRIORITY_LOWEST) && |
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( pri <= LOWER_LIMIT_PRIORITY_LOWEST)) |
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{ |
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priority = EPriorityLow; |
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} |
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else if ((pri >= UPPER_LIMIT_PRIORITY_BELOW_NORMAL) && |
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( pri <= LOWER_LIMIT_PRIORITY_BELOW_NORMAL)) |
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{ |
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priority = EPriorityBackground; |
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} |
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else if((pri >= UPPER_LIMIT_PRIORITY_NORMAL) && |
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( pri <= LOWER_LIMIT_PRIORITY_NORMAL)) |
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{ |
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priority = EPriorityForeground; |
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} |
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else if((pri >= UPPER_LIMIT_PRIORITY_ABOVE_NORMAL) && |
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( pri <= LOWER_LIMIT_PRIORITY_ABOVE_NORMAL)) |
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{ |
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priority = EPriorityHigh; |
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} |
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/* If priority is anything other than this, |
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Symbian wont change it for user process/thread*/ |
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return priority; |
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} |
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|
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/* |
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This function setpriority() checks if the which and who parameters |
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sent are 'the process priority' and 'the current process' respectively, |
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i.e. PROC_PROCESS and 0 respectively. And calls the function convPri() |
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to check in which range the priority falls and returns likewise. |
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It returns a value in the range 0 on success and -1 on failure. |
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|
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The function setpriority() shall ignore the values PRIO_PGRP, |
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PRIO_USER as the argument 'which' and any other value other than |
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0 for 'who' shall not be considered. For effective change in priority, |
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the 'value' should be in the range of -15 to 19. If the 'value' is |
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greater than the greatest or less than the least, it will set the 'value' |
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to the maximum or minimum value respectively. |
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*/ |
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extern "C" { |
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|
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EXPORT_C int setpriority( int which, int who, int value ) |
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{ |
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int retval = -1; |
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|
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if((who == 0) && (which == PRIO_PROCESS )) |
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{ |
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if(value > LOWER_LIMIT_PRIORITY_LOWEST) |
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{ |
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value = LOWER_LIMIT_PRIORITY_LOWEST; |
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} |
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if(value < UPPER_LIMIT_PRIORITY_HIGHEST) |
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{ |
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value = UPPER_LIMIT_PRIORITY_ABOVE_NORMAL; |
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105 |
} |
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106 |
|
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int priority = convPri( value ); |
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if( priority != -1 ) |
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109 |
{ |
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RProcess pro; |
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pro.SetPriority( convPri( value ) ); |
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ProcPriority = value; |
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retval = 0; |
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114 |
} |
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} |
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//handling error case and not supported case |
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if( retval == -1 ) |
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118 |
{ |
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errno = ENOSYS; |
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} |
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return retval; |
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} |
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} //extern "C" |