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Introduced OpenThreads::SetProcessorAffinityMaskOfCurrentThread(unsigned long cpumask) and Threads::setProcessorAffinityMask(unsigned long cpumask) to allow finer grained control over the CPU affinity.

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Robert Osfield
2016-09-26 19:18:15 +01:00
parent cd56639e67
commit 0f8a5a86e2
3 changed files with 87 additions and 52 deletions
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41
include/OpenThreads/Thread
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@@ -35,12 +35,18 @@ namespace OpenThreads {
extern OPENTHREAD_EXPORT_DIRECTIVE int GetNumberOfProcessors();
/**
* Set the processor affinity of current thread.
*
* Note, systems where no support exists no affinity will be set, and -1 will be returned.
*
* Set the processor affinity mask of current thread. If you want to allow thread to run on any processor core use ~0ul for the cpumask
*/
extern OPENTHREAD_EXPORT_DIRECTIVE int SetProcessorAffinityOfCurrentThread(unsigned int cpunum);
extern OPENTHREAD_EXPORT_DIRECTIVE int SetProcessorAffinityMaskOfCurrentThread(unsigned long cpumask);
/**
* Set the processor affinity of current thread.
*/
inline int SetProcessorAffinityOfCurrentThread(unsigned int cpunum)
{
unsigned long cpumask = 1ul << cpunum;
return SetProcessorAffinityMaskOfCurrentThread(cpumask);
}
/**
* @class Thread
@@ -332,15 +338,28 @@ public:
void* getImplementation(){ return _prvData; };
/** Thread's processor affinity method. This binds a thread to a
* processor whenever possible. This call must be made before
/** Set the Thread's processor affinity to a single CPU.
* This call must be made before
* start() or startThread() and has no effect after the thread
* has been running. In the pthreads implementation, this is only
* implemented on sgi, through a pthread extension. On other pthread
* platforms this is ignored. Returns 0 on success, implementation's
* has been running. Returns 0 on success, implementation's
* error on failure, or -1 if ignored.
*/
int setProcessorAffinity( unsigned int cpunum );
int setProcessorAffinity( unsigned int cpunum )
{
unsigned long cpumask = 1ul << cpunum;
return setProcessorAffinityMask(cpumask);
}
/** Set the Thread's processor affinity to a one or more CPU's using mask.
* If you want this threadd to run on any processor core then use a cpumask of ~0ul
* This call must be made before
* start() or startThread() and has no effect after the thread
* has been running. Returns 0 on success, implementation's
* error on failure, or -1 if ignored.
*/
int setProcessorAffinityMask( unsigned long cpumask);
/** microSleep method, equivalent to the posix usleep(microsec).
* This is not strictly thread API but is used