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/* SPDX-License-Identifier: GPL-3.0-only */
#ifdef __APPLE__
#include <stdlib.h>
#include <sys/types.h>
#include <sys/sysctl.h>
#elif linux
#define _GNU_SOURCE
#include <sched.h>
#include <stdlib.h>
#elif __FreeBSD__
#include <stdlib.h>
#include <unistd.h>
#include <pthread_np.h>
#else
#error unsupported platform
#endif
#include <util.h>
#include <platform.h>
#include <message.h>
#ifdef __APPLE__
int nr_cpus()
{
int n;
size_t size = sizeof(n);
if (sysctlbyname("machdep.cpu.core_count", &n, &size, NULL, 0) != 0) {
mscp_set_error("failed to get number of cpu cores: %s", strerrno());
return -1;
}
return n;
}
int set_thread_affinity(pthread_t tid, int core)
{
pr_warn("setting thread afinity is not implemented on apple\n");
return 0;
}
static void random_string(char *buf, size_t size)
{
char chars[] = "abcdefhijklmnopqrstuvwxyz1234567890";
int n, x;
for (n = 0; n < size - 1; n++) {
x = arc4random() % (sizeof(chars) - 1);
buf[n] = chars[x];
}
buf[size - 1] = '\0';
}
sem_t *sem_create(int value)
{
char sem_name[30] = "mscp-";
sem_t *sem;
int n;
n = strlen(sem_name);
random_string(sem_name + n, sizeof(sem_name) - n - 1);
if ((sem = sem_open(sem_name, O_CREAT, 600, value)) == SEM_FAILED)
return NULL;
return sem;
}
int sem_release(sem_t *sem)
{
return sem_close(sem);
}
#endif
#ifdef linux
int nr_cpus()
{
cpu_set_t cpu_set;
if (sched_getaffinity(0, sizeof(cpu_set_t), &cpu_set) == 0)
return CPU_COUNT(&cpu_set);
return -1;
}
#endif
#ifdef __FreeBSD__
int nr_cpus()
{
long nr_cpus = sysconf(_SC_NPROCESSORS_ONLN);
return nr_cpus;
}
#endif
#if defined(linux) || defined(__FreeBSD__)
int set_thread_affinity(pthread_t tid, int core)
{
cpu_set_t target_cpu_set;
int ret = 0;
CPU_ZERO(&target_cpu_set);
CPU_SET(core, &target_cpu_set);
ret = pthread_setaffinity_np(tid, sizeof(target_cpu_set), &target_cpu_set);
if (ret < 0)
mscp_set_error("failed to set thread/cpu affinity for core %d: %s",
core, strerrno());
return ret;
}
sem_t *sem_create(int value)
{
sem_t *sem;
if ((sem = malloc(sizeof(*sem))) == NULL)
return NULL;
if (sem_init(sem, 0, value) < 0) {
free(sem);
return NULL;
}
return sem;
}
int sem_release(sem_t *sem)
{
free(sem);
return 0;
}
#endif
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