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Add a CPU affinity set to the TCB if SMP is enable and use this CPU set as a mask for determining which CPUs the thread may run on. Add an affinity field to the attrributes to permit controlling which CPUs a pthread may run on. Implements pthread_att_setaffinity_np() and pthread_attr_getaffinity_np().

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This commit is contained in:
Gregory Nutt
2016-02-19 17:33:35 -06:00
parent 2075eb7932
commit a633353ec3
28 changed files with 174 additions and 355 deletions
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sched/pthread/pthread_create.c
+15 -1
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@@ -1,7 +1,7 @@
/****************************************************************************
* sched/pthread/pthread_create.c
*
* Copyright (C) 2007-2009, 2011, 2013-2015 Gregory Nutt. All rights reserved.
* Copyright (C) 2007-2009, 2011, 2013-2016 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Redistribution and use in source and binary forms, with or without
@@ -404,6 +404,20 @@ int pthread_create(FAR pthread_t *thread, FAR const pthread_attr_t *attr,
goto errout_with_join;
}
#ifdef CONFIG_SMP
/* pthread_schedsetup() will set the affinity mask by inheriting the
* setting from the parent task. We need to override this setting
* with the value from the pthread attributes unless that value is
* zero: Zero is the default value and simply means to inherit the
* parent thread's affinity mask.
*/
if ( attr->affinity != 0)
{
ptcb->cmn.affinity = attr->affinity;
}
#endif
/* Configure the TCB for a pthread receiving on parameter
* passed by value
*/