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threads.c
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threads.c
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#ifdef __linux__
#define _GNU_SOURCE
#endif
#include <platform.h>
#if defined(PLATFORM_IS_LINUX) || defined(PLATFORM_IS_BSD) || defined(PLATFORM_IS_EMSCRIPTEN)
#include <sched.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <sys/mman.h>
#endif
#if defined(PLATFORM_IS_FREEBSD) || defined(PLATFORM_IS_DRAGONFLY) || defined(PLATFORM_IS_OPENBSD)
#include <pthread_np.h>
#endif
#if defined(PLATFORM_IS_FREEBSD)
#include <sys/cpuset.h>
typedef cpuset_t cpu_set_t;
#endif
#if defined(PLATFORM_IS_LINUX)
#include <dlfcn.h>
#include <stdio.h>
struct bitmask
{
unsigned long size;
unsigned long *maskp;
};
static int (*_numa_available)();
static int (*_numa_num_task_cpus)();
static void (*_numa_set_localalloc)();
static int (*_numa_node_of_cpu)(int cpu);
static void* (*_numa_alloc_onnode)(size_t size, int node);
static void* (*_numa_alloc)(size_t size);
static void (*_numa_free)(void* mem, size_t size);
static struct bitmask** _numa_all_nodes_ptr;
static struct bitmask* (*_numa_allocate_cpumask)();
static void (*_numa_bitmask_free)(struct bitmask*);
static int (*_numa_node_to_cpus)(int, struct bitmask*);
static unsigned int (*_numa_bitmask_weight)(const struct bitmask *);
static int (*_numa_bitmask_isbitset)(const struct bitmask*, unsigned int);
static bool use_numa = false;
#define LOAD_SYMBOL(sym) \
{ \
typedef typeof(_##sym) f; \
_##sym = (f)dlsym(lib, #sym); \
err += (_##sym == NULL); \
}
bool ponyint_numa_init()
{
void* lib = dlopen("libnuma.so.1", RTLD_LAZY);
int err = 0;
if(lib == NULL)
return false;
LOAD_SYMBOL(numa_available);
LOAD_SYMBOL(numa_num_task_cpus);
LOAD_SYMBOL(numa_set_localalloc);
LOAD_SYMBOL(numa_node_of_cpu);
LOAD_SYMBOL(numa_alloc_onnode);
LOAD_SYMBOL(numa_alloc);
LOAD_SYMBOL(numa_free);
LOAD_SYMBOL(numa_all_nodes_ptr);
LOAD_SYMBOL(numa_allocate_cpumask);
LOAD_SYMBOL(numa_bitmask_free);
LOAD_SYMBOL(numa_node_to_cpus);
LOAD_SYMBOL(numa_bitmask_weight);
LOAD_SYMBOL(numa_bitmask_isbitset);
if(err != 0)
return false;
if(_numa_available() == -1)
return false;
use_numa = true;
_numa_set_localalloc();
return true;
}
uint32_t ponyint_numa_cores()
{
if(use_numa)
return _numa_num_task_cpus();
return 0;
}
static uint32_t numa_core_list(cpu_set_t* mask, uint32_t index, uint32_t* list)
{
uint32_t nodes = _numa_bitmask_weight(*_numa_all_nodes_ptr);
struct bitmask* cpu = _numa_allocate_cpumask();
uint32_t node_count = 0;
for(uint32_t i = 0; node_count < nodes; i++)
{
if(!_numa_bitmask_isbitset(*_numa_all_nodes_ptr, i))
continue;
node_count++;
_numa_node_to_cpus(i, cpu);
uint32_t cpus = _numa_bitmask_weight(cpu);
uint32_t cpu_count = 0;
for(uint32_t j = 0; cpu_count < cpus; j++)
{
if(!_numa_bitmask_isbitset(cpu, j))
continue;
cpu_count++;
if(CPU_ISSET(j, mask))
list[index++] = j;
}
}
_numa_bitmask_free(cpu);
return index;
}
uint32_t ponyint_numa_core_list(cpu_set_t* hw_cpus, cpu_set_t* ht_cpus,
uint32_t* list)
{
if(!use_numa)
return 0;
// Create an ordered list of cpus. Physical CPUs grouped by NUMA node come
// first, followed by hyperthreaded CPUs grouped by NUMA node.
uint32_t index = 0;
index = numa_core_list(hw_cpus, index, list);
index = numa_core_list(ht_cpus, index, list);
return index;
}
uint32_t ponyint_numa_node_of_cpu(uint32_t cpu)
{
if(use_numa)
return _numa_node_of_cpu(cpu);
return 0;
}
#endif
bool ponyint_thread_create(pony_thread_id_t* thread, thread_fn start,
uint32_t cpu, void* arg)
{
bool ret = true;
(void)cpu;
#if defined(PLATFORM_IS_WINDOWS)
uintptr_t p = _beginthreadex(NULL, 0, start, arg, 0, NULL);
if(!p)
return false;
*thread = (HANDLE)p;
#elif defined(PLATFORM_IS_EMSCRIPTEN)
if(pthread_create(thread, NULL, start, arg))
ret = false;
#else
bool setstack_called = false;
struct rlimit limit;
pthread_attr_t attr;
pthread_attr_t* attr_p = &attr;
pthread_attr_init(attr_p);
// Some systems, e.g., macOS, hav a different default default
// stack size than the typical system's RLIMIT_STACK.
// Let's use RLIMIT_STACK's current limit if it is sane.
if(getrlimit(RLIMIT_STACK, &limit) == 0 &&
limit.rlim_cur != RLIM_INFINITY &&
limit.rlim_cur >= (rlim_t)PTHREAD_STACK_MIN)
{
#if defined(PLATFORM_IS_LINUX)
if(cpu != (uint32_t)-1 && use_numa)
{
cpu_set_t set;
CPU_ZERO(&set);
CPU_SET(cpu, &set);
int node = _numa_node_of_cpu(cpu);
void* stack = _numa_alloc_onnode((size_t)limit.rlim_cur, node);
if (stack != NULL) {
pthread_attr_setstack(&attr, stack, (size_t)limit.rlim_cur);
setstack_called = true;
}
}
#endif
if(! setstack_called)
pthread_attr_setstacksize(&attr, (size_t)limit.rlim_cur);
} else {
attr_p = NULL;
}
if(pthread_create(thread, attr_p, start, arg))
ret = false;
pthread_attr_destroy(&attr);
#endif
return ret;
}
bool ponyint_thread_join(pony_thread_id_t thread)
{
#ifdef PLATFORM_IS_WINDOWS
WaitForSingleObject(thread, INFINITE);
CloseHandle(thread);
#else
if(pthread_join(thread, NULL))
return false;
#endif
return true;
}
void ponyint_thread_detach(pony_thread_id_t thread)
{
#ifndef PLATFORM_IS_WINDOWS
pthread_detach(thread);
#endif
}
pony_thread_id_t ponyint_thread_self()
{
#ifdef PLATFORM_IS_WINDOWS
return GetCurrentThread();
#else
return pthread_self();
#endif
}
#if defined(USE_SCHEDULER_SCALING_PTHREADS)
void ponyint_thread_suspend(pony_signal_event_t signal, pthread_mutex_t* mut)
#else
void ponyint_thread_suspend(pony_signal_event_t signal)
#endif
{
#ifdef PLATFORM_IS_WINDOWS
WaitForSingleObject(signal, INFINITE);
#elif defined(USE_SCHEDULER_SCALING_PTHREADS)
int ret;
// wait for condition variable (will sleep and release mutex)
ret = pthread_cond_wait(signal, mut);
// TODO: What to do if `ret` is an unrecoverable error?
(void) ret;
#else
int sig;
sigset_t sigmask;
sigemptyset(&sigmask); /* zero out all bits */
sigaddset(&sigmask, signal); /* unblock desired signal */
// sleep waiting for signal to wake up again
sigwait(&sigmask, &sig);
#endif
}
int ponyint_thread_wake(pony_thread_id_t thread, pony_signal_event_t signal)
{
int ret;
#if defined(PLATFORM_IS_WINDOWS)
(void) thread;
ret = !SetEvent(signal);
#elif defined(USE_SCHEDULER_SCALING_PTHREADS)
(void) thread;
// signal condition variable
ret = pthread_cond_signal(signal);
#else
ret = pthread_kill(thread, signal);
#endif
return ret;
}
#ifdef PLATFORM_IS_ARM32
uint32_t __pony_popcount(uint32_t x) {
return (uint32_t)__builtin_popcount(x);
}
uint32_t __pony_ffs(uint32_t x) {
return (uint32_t)__builtin_ffs((int)x);
}
uint32_t __pony_ffsll(uint64_t x) {
return (uint32_t)__builtin_ffsll((long long int)x);
}
uint32_t __pony_ctz(uint32_t x) {
return (uint32_t)__builtin_ctz(x);
}
uint32_t __pony_clz(uint32_t x) {
return (uint32_t)__builtin_clz(x);
}
uint32_t __pony_clzll(uint64_t x) {
return (uint32_t)__builtin_clzll(x);
}
#endif