author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Tue, 02 Feb 2010 02:01:42 +0200 | |
changeset 0 | e4d67989cc36 |
permissions | -rw-r--r-- |
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/** @file ../include/sys/resource.h |
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@internalComponent |
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*/ |
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/** @fn getpriority(int which, int who) |
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@param which |
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@param who |
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Note: This description also covers the following functions - |
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setpriority() |
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@return Since getpriority can legitimately return the value -1, it is necessary |
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to clear the external variable errno prior to the |
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call, then check it afterward to determine |
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if a -1 is an error or a legitimate value. The setpriority returns 0 on success and -1 on error with the errno set. |
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The scheduling |
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priority of the process, process group, or user, as indicated by which and who is obtained with the getpriority system call and set with the setpriority system call. |
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The which argument |
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is one of PRIO_PROCESS, PRIO_PGRP, or PRIO_USER, and who is interpreted relative to which (a process identifier for PRIO_PROCESS, process group |
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identifier for PRIO_PGRP, and a user ID for PRIO_USER ). A zero value of who denotes the current process, process group, or user. |
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The prio argument |
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is a value in the range -20 to 20. |
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The default priority is 0; |
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lower priorities cause more favorable scheduling. |
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If the prio is greater than the greatest priority supported, it is set to the greatest priority supported. |
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If the prio is lesser than the least priority supported, it is set to the least priority supported. |
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Examples: |
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@code |
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#include<sys/resource.h> |
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#include<unistd.h> |
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#include<stdio.h> |
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int test_getpriority() |
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{ |
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int retVal; |
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errno = 0; |
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retVal = getpriority(PRIO_PROCESS, 0); |
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if((retVal == -1) && (errno == ENOSYS)) |
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{ |
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printf("Failed"); |
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return -1; |
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} |
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else |
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{ |
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printf("getpriority passed"); |
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printf(" |
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priority = %d ", retVal); |
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} |
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return 0; |
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} |
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@endcode |
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Output |
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@code |
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getpriority passed |
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priority = 0 |
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|
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@endcode |
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@code |
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#include<sys/resource.h> |
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#include<unistd.h> |
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#include<stdio.h> |
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int test_setpriority() |
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{ |
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int retVal; |
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errno = 0; |
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retVal = setpriority(PRIO_PROCESS, 0, 0); |
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|
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if((retVal == -1) && (errno == ENOSYS)) |
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{ |
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printf("Failed"); |
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return -1; |
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} |
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else |
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{ |
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printf("Setpriority passed"); |
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printf(" getpriority now: %d", getpriority(PRIO_PROCESS,0)) |
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} |
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return 0; |
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} |
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|
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@endcode |
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Output |
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@code |
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Setpriority passed |
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getpriority now: 0 |
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@endcode |
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Limitations: |
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1. The values PRIO_PGRP and PRIO_USER for the which and any value other than 0 for who are not supported, when given return ENOSYS. |
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2. To effectively increase or decrease the priority of the process, one should consider the following: |
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Highest -16 to -20 Above Normal -6 to -15 Normal +4 to -5 Below Normal +14 to +5 Lowest +20 to +15 3. |
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The setting of the priority to values -16 to -20 is not supported, the use of which sets errno to EINVAL. |
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@see nice() |
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@publishedAll |
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@externallyDefinedApi |
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*/ |
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/** @fn setpriority(int which, int who, int value) |
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@param which |
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@param who |
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@param value |
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Refer to getpriority() for the documentation |
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@see nice() |
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@publishedAll |
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@externallyDefinedApi |
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*/ |
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/** @struct rlimit |
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Contains the following members, |
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@publishedAll |
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@externallyDefinedApi |
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*/ |
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/** @var rlimit::rlim_cur |
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current (soft) limit |
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*/ |
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/** @var rlimit::rlim_max |
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maximum value for rlim_cur |
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*/ |
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/** @struct rusage |
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Contains the following members, |
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@publishedAll |
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@externallyDefinedApi |
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*/ |
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/** @var rusage::ru_utime |
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user time used |
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*/ |
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/** @var rusage::ru_stime |
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system time used |
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*/ |
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/** @var rusage::ru_maxrss |
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max resident set size |
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*/ |
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/** @var rusage::ru_ixrss |
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integral shared memory size |
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*/ |
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/** @var rusage::ru_idrss |
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integral unshared data |
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*/ |
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/** @var rusage::ru_isrss |
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integral unshared stack |
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*/ |
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/** @var rusage::ru_minflt |
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page reclaims |
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*/ |
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page faults |
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*/ |
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/** @var rusage::ru_nswap |
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(c + j) swaps |
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*/ |
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/** @var rusage::ru_inblock |
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block input operations |
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*/ |
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/** @var rusage::ru_oublock |
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block output operations |
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*/ |
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/** @var rusage::ru_msgsnd |
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messages sent |
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*/ |
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/** @var rusage::ru_msgrcv |
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messages received |
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*/ |
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/** @var rusage::ru_nsignals |
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signals received |
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*/ |
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/** @var rusage::ru_nvcsw |
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voluntary context switches |
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*/ |
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/** @var rusage::ru_nivcsw |
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involuntary |
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*/ |
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/** @typedef typedef __rlim_t rlim_t |
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unsigned long int |
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cpu time in milliseconds |
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Resource utilization information. |
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