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https://github.com/python/cpython
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4d0d1c3866
If the timeout is greater than PY_TIMEOUT_MAX, PyThread_acquire_lock_timed() uses a timeout of PY_TIMEOUT_MAX microseconds, which is around 280.6 years. This case is unlikely and limiting a timeout to 280.6 years sounds like a reasonable trade-off. The constant PY_TIMEOUT_MAX is not used in PyPI top 5,000 projects.
112 lines
3.9 KiB
C
112 lines
3.9 KiB
C
#ifndef Py_PYTHREAD_H
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#define Py_PYTHREAD_H
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typedef void *PyThread_type_lock;
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* Return status codes for Python lock acquisition. Chosen for maximum
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* backwards compatibility, ie failure -> 0, success -> 1. */
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typedef enum PyLockStatus {
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PY_LOCK_FAILURE = 0,
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PY_LOCK_ACQUIRED = 1,
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PY_LOCK_INTR
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} PyLockStatus;
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PyAPI_FUNC(void) PyThread_init_thread(void);
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PyAPI_FUNC(unsigned long) PyThread_start_new_thread(void (*)(void *), void *);
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PyAPI_FUNC(void) _Py_NO_RETURN PyThread_exit_thread(void);
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PyAPI_FUNC(unsigned long) PyThread_get_thread_ident(void);
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#if (defined(__APPLE__) || defined(__linux__) || defined(_WIN32) \
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|| defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__NetBSD__) \
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|| defined(__DragonFly__) || defined(_AIX))
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#define PY_HAVE_THREAD_NATIVE_ID
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PyAPI_FUNC(unsigned long) PyThread_get_thread_native_id(void);
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#endif
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PyAPI_FUNC(PyThread_type_lock) PyThread_allocate_lock(void);
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PyAPI_FUNC(void) PyThread_free_lock(PyThread_type_lock);
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PyAPI_FUNC(int) PyThread_acquire_lock(PyThread_type_lock, int);
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#define WAIT_LOCK 1
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#define NOWAIT_LOCK 0
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// PY_TIMEOUT_T is the integral type used to specify timeouts when waiting
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// on a lock (see PyThread_acquire_lock_timed() below).
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#define PY_TIMEOUT_T long long
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/* If microseconds == 0, the call is non-blocking: it returns immediately
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even when the lock can't be acquired.
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If microseconds > 0, the call waits up to the specified duration.
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If microseconds < 0, the call waits until success (or abnormal failure)
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If *microseconds* is greater than PY_TIMEOUT_MAX, clamp the timeout to
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PY_TIMEOUT_MAX microseconds.
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If intr_flag is true and the acquire is interrupted by a signal, then the
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call will return PY_LOCK_INTR. The caller may reattempt to acquire the
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lock.
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*/
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PyAPI_FUNC(PyLockStatus) PyThread_acquire_lock_timed(PyThread_type_lock,
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PY_TIMEOUT_T microseconds,
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int intr_flag);
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PyAPI_FUNC(void) PyThread_release_lock(PyThread_type_lock);
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PyAPI_FUNC(size_t) PyThread_get_stacksize(void);
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PyAPI_FUNC(int) PyThread_set_stacksize(size_t);
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#if !defined(Py_LIMITED_API) || Py_LIMITED_API+0 >= 0x03030000
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PyAPI_FUNC(PyObject*) PyThread_GetInfo(void);
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#endif
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/* Thread Local Storage (TLS) API
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TLS API is DEPRECATED. Use Thread Specific Storage (TSS) API.
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The existing TLS API has used int to represent TLS keys across all
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platforms, but it is not POSIX-compliant. Therefore, the new TSS API uses
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opaque data type to represent TSS keys to be compatible (see PEP 539).
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*/
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Py_DEPRECATED(3.7) PyAPI_FUNC(int) PyThread_create_key(void);
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Py_DEPRECATED(3.7) PyAPI_FUNC(void) PyThread_delete_key(int key);
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Py_DEPRECATED(3.7) PyAPI_FUNC(int) PyThread_set_key_value(int key,
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void *value);
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Py_DEPRECATED(3.7) PyAPI_FUNC(void *) PyThread_get_key_value(int key);
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Py_DEPRECATED(3.7) PyAPI_FUNC(void) PyThread_delete_key_value(int key);
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/* Cleanup after a fork */
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Py_DEPRECATED(3.7) PyAPI_FUNC(void) PyThread_ReInitTLS(void);
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#if !defined(Py_LIMITED_API) || Py_LIMITED_API+0 >= 0x03070000
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/* New in 3.7 */
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/* Thread Specific Storage (TSS) API */
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typedef struct _Py_tss_t Py_tss_t; /* opaque */
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PyAPI_FUNC(Py_tss_t *) PyThread_tss_alloc(void);
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PyAPI_FUNC(void) PyThread_tss_free(Py_tss_t *key);
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/* The parameter key must not be NULL. */
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PyAPI_FUNC(int) PyThread_tss_is_created(Py_tss_t *key);
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PyAPI_FUNC(int) PyThread_tss_create(Py_tss_t *key);
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PyAPI_FUNC(void) PyThread_tss_delete(Py_tss_t *key);
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PyAPI_FUNC(int) PyThread_tss_set(Py_tss_t *key, void *value);
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PyAPI_FUNC(void *) PyThread_tss_get(Py_tss_t *key);
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#endif /* New in 3.7 */
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#ifndef Py_LIMITED_API
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# define Py_CPYTHON_PYTHREAD_H
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# include "cpython/pythread.h"
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# undef Py_CPYTHON_PYTHREAD_H
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#endif
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#ifdef __cplusplus
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}
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#endif
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#endif /* !Py_PYTHREAD_H */
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