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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/init/os_start.c
+25 -3
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@@ -73,6 +73,16 @@
#endif
#include "init/init.h"
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
#ifdef CONFIG_SMP
/* This set of all CPUs */
# define SCHED_ALL_CPUS ((1 << CONFIG_SMP_NCPUS) - 1)
#endif /* CONFIG_SMP */
/****************************************************************************
* Public Data
****************************************************************************/
@@ -452,19 +462,31 @@ void os_start(void)
}
/* Set the task flags to indicate that this is a kernel thread and, if
* configured for SMP, that this task is assigned to the correct CPU.
* configured for SMP, that this task is locked to this CPU.
*/
#ifdef CONFIG_SMP
g_idletcb[cpu].cmn.flags = (TCB_FLAG_TTYPE_KERNEL | TCB_FLAG_CPU_ASSIGNED);
g_idletcb[cpu].cmn.flags = (TCB_FLAG_TTYPE_KERNEL | TCB_FLAG_CPU_LOCKED);
g_idletcb[cpu].cmn.cpu = cpu;
#else
g_idletcb[cpu].cmn.flags = TCB_FLAG_TTYPE_KERNEL;
#endif
/* Set the IDLE task name */
#ifdef CONFIG_SMP
/* Set the affinity mask to allow the thread to run on all CPUs. No,
* this IDLE thread can only run on its assigned CPU. That is
* enforced by the TCB_FLAG_CPU_LOCKED which overrides the affinity
* mask. This is essential because all tasks inherit the affinity
* mask from their parent and, ultimately, the parent of all tasks is
* the IDLE task.
*/
g_idletcb[cpu].cmn.affinity = SCHED_ALL_CPUS;
#endif
#if CONFIG_TASK_NAME_SIZE > 0
/* Set the IDLE task name */
# ifdef CONFIG_SMP
snprintf(g_idletcb[cpu].cmn.name, CONFIG_TASK_NAME_SIZE, "CPU%d IDLE", cpu);
# else