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#include "pycore_interp.h" // _PyInterpreterState.threads.stacksize

#include "pycore_time.h" // _PyTime_AsMicroseconds()

/* This code implemented by Dag.Gruneau@elsa.preseco.comm.se */

/* Fast NonRecursiveMutex support by Yakov Markovitch, markovitch@iso.ru */

/* Eliminated some memory leaks, gsw@agere.com */

#include <windows.h>

#include <limits.h>

#ifdef HAVE_PROCESS_H

#include <process.h>

#endif

unsigned long PyThread_get_thread_ident(void);

#ifdef PY_HAVE_THREAD_NATIVE_ID

unsigned long PyThread_get_thread_native_id(void);

#endif

* Initialization for the current runtime.

static void

PyThread__init_thread(void)

{

// Initialization of the C package should not be needed.

}

* Thread support.

typedef struct {

void (*func)(void*);

void *arg;

} callobj;

/* thunker to call adapt between the function type used by the system's

thread start function and the internally used one. */

static unsigned __stdcall

bootstrap(void *call)

{

callobj *obj = (callobj*)call;

void (*func)(void*) = obj->func;

void *arg = obj->arg;

HeapFree(GetProcessHeap(), 0, obj);

func(arg);

return 0;

}

int

PyThread_start_joinable_thread(void (*func)(void *), void *arg,

PyThread_ident_t* ident, PyThread_handle_t* handle) {

HANDLE hThread;

unsigned threadID;

callobj *obj;

if (!initialized)

PyThread_init_thread();

obj = (callobj*)HeapAlloc(GetProcessHeap(), 0, sizeof(*obj));

if (!obj)

return -1;

obj->func = func;

obj->arg = arg;

PyThreadState *tstate = _PyThreadState_GET();

size_t stacksize = tstate ? tstate->interp->threads.stacksize : 0;

hThread = (HANDLE)_beginthreadex(0,

Py_SAFE_DOWNCAST(stacksize, Py_ssize_t, unsigned int),

bootstrap, obj,

0, &threadID);

if (hThread == 0) {

/* I've seen errno == EAGAIN here, which means "there are

* too many threads".

HeapFree(GetProcessHeap(), 0, obj);

return -1;

}

*ident = threadID;

// The cast is safe since HANDLE is pointer-sized

*handle = (PyThread_handle_t) hThread;

return 0;

}

unsigned long

PyThread_start_new_thread(void (*func)(void *), void *arg) {

PyThread_handle_t handle;

PyThread_ident_t ident;

if (PyThread_start_joinable_thread(func, arg, &ident, &handle)) {

return PYTHREAD_INVALID_THREAD_ID;

}

CloseHandle((HANDLE) handle);

// The cast is safe since the ident is really an unsigned int

return (unsigned long) ident;

}

int

PyThread_join_thread(PyThread_handle_t handle) {

HANDLE hThread = (HANDLE) handle;

int errored = (WaitForSingleObject(hThread, INFINITE) != WAIT_OBJECT_0);

CloseHandle(hThread);

return errored;

}

int

PyThread_detach_thread(PyThread_handle_t handle) {

HANDLE hThread = (HANDLE) handle;

return (CloseHandle(hThread) == 0);

}

* Return the thread Id instead of a handle. The Id is said to uniquely identify the

* thread in the system

PyThread_ident_t

PyThread_get_thread_ident_ex(void)

{

if (!initialized)

PyThread_init_thread();

return GetCurrentThreadId();

}

unsigned long

PyThread_get_thread_ident(void)

{

return (unsigned long) PyThread_get_thread_ident_ex();

}

#ifdef PY_HAVE_THREAD_NATIVE_ID

* Return the native Thread ID (TID) of the calling thread.

* The native ID of a thread is valid and guaranteed to be unique system-wide

* from the time the thread is created until the thread has been terminated.

unsigned long

PyThread_get_thread_native_id(void)

{

if (!initialized) {

PyThread_init_thread();

}

DWORD native_id;

native_id = GetCurrentThreadId();

return (unsigned long) native_id;

}

#endif

void _Py_NO_RETURN

PyThread_exit_thread(void)

{

if (!initialized)

exit(0);

_endthreadex(0);

Py_UNREACHABLE();

}

void _Py_NO_RETURN

PyThread_hang_thread(void)

{

while (1) {

SleepEx(INFINITE, TRUE);

}

/* minimum/maximum thread stack sizes supported */

#define THREAD_MIN_STACKSIZE 0x8000 /* 32 KiB */

#define THREAD_MAX_STACKSIZE 0x10000000 /* 256 MiB */

/* set the thread stack size.

* Return 0 if size is valid, -1 otherwise.

static int

_pythread_nt_set_stacksize(size_t size)

{

/* set to default */

if (size == 0) {

_PyInterpreterState_GET()->threads.stacksize = 0;

return 0;

}

/* valid range? */

if (size >= THREAD_MIN_STACKSIZE && size < THREAD_MAX_STACKSIZE) {

_PyInterpreterState_GET()->threads.stacksize = size;

return 0;

}

return -1;

}

#define THREAD_SET_STACKSIZE(x) _pythread_nt_set_stacksize(x)

/* Thread Local Storage (TLS) API

This API is DEPRECATED since Python 3.7. See PEP 539 for details.

int

PyThread_create_key(void)

{

DWORD result = TlsAlloc();

if (result == TLS_OUT_OF_INDEXES)

return -1;

return (int)result;

}

void

PyThread_delete_key(int key)

{

TlsFree(key);

}

int

PyThread_set_key_value(int key, void *value)

{

BOOL ok = TlsSetValue(key, value);

return ok ? 0 : -1;

}

void *

PyThread_get_key_value(int key)

{

return TlsGetValue(key);

}

void

PyThread_delete_key_value(int key)

{

/* NULL is used as "key missing", and it is also the default

* given by TlsGetValue() if nothing has been set yet.

TlsSetValue(key, NULL);

}

/* reinitialization of TLS is not necessary after fork when using

* the native TLS functions. And forking isn't supported on Windows either.

void

PyThread_ReInitTLS(void)

{

}

/* Thread Specific Storage (TSS) API

Platform-specific components of TSS API implementation.

int

PyThread_tss_create(Py_tss_t *key)

{

assert(key != NULL);

/* If the key has been created, function is silently skipped. */

if (key->_is_initialized) {

return 0;

}

DWORD result = TlsAlloc();

if (result == TLS_OUT_OF_INDEXES) {

return -1;

}

/* In Windows, platform-specific key type is DWORD. */

key->_key = result;

key->_is_initialized = 1;

return 0;

}

void

PyThread_tss_delete(Py_tss_t *key)

{

assert(key != NULL);

/* If the key has not been created, function is silently skipped. */

if (!key->_is_initialized) {

return;

}

TlsFree(key->_key);

key->_key = TLS_OUT_OF_INDEXES;

key->_is_initialized = 0;

}

int

PyThread_tss_set(Py_tss_t *key, void *value)

{

assert(key != NULL);

BOOL ok = TlsSetValue(key->_key, value);

return ok ? 0 : -1;

}

void *

PyThread_tss_get(Py_tss_t *key)

{

assert(key != NULL);

int err = GetLastError();

void *r = TlsGetValue(key->_key);

if (r || !GetLastError()) {

SetLastError(err);

}

return r;

}

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