/* sys/cpuset.h

This file is part of Cygwin.

This software is a copyrighted work licensed under the terms of the
Cygwin license.  Please consult the file "CYGWIN_LICENSE" for
details. */

#ifndef _SYS_CPUSET_H_
#define _SYS_CPUSET_H_

#ifdef __cplusplus
extern "C" {
#endif

typedef __SIZE_TYPE__ __cpu_mask;
#define __CPU_SETSIZE 1024  // maximum number of logical processors tracked
#define __NCPUBITS (8 * sizeof (__cpu_mask))  // max size of processor group
#define __CPU_GROUPMAX (__CPU_SETSIZE / __NCPUBITS)  // maximum group number

#define __CPUELT(cpu)  ((cpu) / __NCPUBITS)
#define __CPUMASK(cpu) ((__cpu_mask) 1 << ((cpu) % __NCPUBITS))

typedef struct
{
  __cpu_mask __bits[__CPU_GROUPMAX];
} cpu_set_t;

#if __GNU_VISIBLE
int __sched_getaffinity_sys (pid_t, size_t, cpu_set_t *);

/* These macros alloc or free dynamically-sized cpu sets of size 'num' cpus.
   Allocations are padded such that full-word operations can be done easily. */
#define CPU_ALLOC_SIZE(num) ((num+__NCPUBITS-1) / __NCPUBITS) * sizeof (__cpu_mask)
#define CPU_ALLOC(num)      __builtin_malloc (CPU_ALLOC_SIZE(num))
#define CPU_FREE(set)       __builtin_free (set)

/* These _S macros operate on dynamically-sized cpu sets of size 'siz' bytes */
#define CPU_ZERO_S(siz, set)    __builtin_memset (set, 0, siz)

#define CPU_SET_S(cpu,siz,set) \
	if (cpu < 8 * siz) \
	  (set)->__bits[__CPUELT(cpu)] |= __CPUMASK(cpu);

#define CPU_CLR_S(cpu,siz,set) \
	if (cpu < 8 * siz) \
	  (set)->__bits[__CPUELT(cpu)] &= ~(__CPUMASK(cpu));

#define CPU_ISSET_S(cpu,siz,set) \
      ({int res = 0; \
	if (cpu < 8 * siz) \
	  res = !!((set)->__bits[__CPUELT(cpu)] & __CPUMASK(cpu)); \
	res;})

#define CPU_COUNT_S(siz, set) \
      ({int tot = 0;\
	for (int i = 0; i < siz / sizeof (__cpu_mask); i++) \
	  tot += __builtin_popcountl ((set)->__bits[i]); \
	tot;})

#define CPU_AND_S(siz, dst, src1, src2) \
	for (int i = 0; i < siz / sizeof (__cpu_mask); i++) \
	  (dst)->__bits[i] = (src1)->__bits[i] & (src2)->__bits[i];

#define CPU_OR_S(siz, dst, src1, src2) \
	for (int i = 0; i < siz / sizeof (__cpu_mask); i++) \
	  (dst)->__bits[i] = (src1)->__bits[i] | (src2)->__bits[i];

#define CPU_XOR_S(siz, dst, src1, src2) \
	for (int i = 0; i < siz / sizeof (__cpu_mask); i++) \
	  (dst)->__bits[i] = (src1)->__bits[i] ^ (src2)->__bits[i];

#define CPU_EQUAL_S(siz, src1, src2) \
      ({int res = 1; \
	for (int i = 0; res && i < siz / sizeof (__cpu_mask); i++) \
	  res &= (src1)->__bits[i] == (src2)->__bits[i]; \
	res;})

/* These macros operate on fixed-size cpu sets of size __CPU_SETSIZE cpus */
#define CPU_ZERO(set)             CPU_ZERO_S(sizeof (cpu_set_t), set)

#define CPU_SET(cpu, set)         CPU_SET_S(cpu, sizeof (cpu_set_t), set)
#define CPU_CLR(cpu, set)         CPU_CLR_S(cpu, sizeof (cpu_set_t), set)
#define CPU_ISSET(cpu, set)       CPU_ISSET_S(cpu, sizeof (cpu_set_t), set)

#define CPU_COUNT(set)            CPU_COUNT_S(sizeof (cpu_set_t), set)
#define CPU_AND(dst, src1, src2)  CPU_AND_S(sizeof (cpu_set_t), dst, src1, src2)
#define CPU_OR(dst, src1, src2)   CPU_OR_S(sizeof (cpu_set_t), dst, src1, src2)
#define CPU_XOR(dst, src1, src2)  CPU_XOR_S(sizeof (cpu_set_t), dst, src1, src2)
#define CPU_EQUAL(src1, src2)     CPU_EQUAL_S(sizeof (cpu_set_t), src1, src2)

#endif /* __GNU_VISIBLE */

#ifdef __cplusplus
}
#endif

#endif /* _SYS_CPUSET_H_ */