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Edit File : pycore_critical_section.h \| Size : 7.78 KB
#ifndef Py_INTERNAL_CRITICAL_SECTION_H #define Py_INTERNAL_CRITICAL_SECTION_H #ifndef Py_BUILD_CORE # error "this header requires Py_BUILD_CORE define" #endif #include "pycore_lock.h" // PyMutex #include "pycore_pystate.h" // _PyThreadState_GET() #include <stdint.h> #ifdef __cplusplus extern "C" { #endif // Tagged pointers to critical sections use the two least significant bits to // mark if the pointed-to critical section is inactive and whether it is a // PyCriticalSection2 object. #define _Py_CRITICAL_SECTION_INACTIVE 0x1 #define _Py_CRITICAL_SECTION_TWO_MUTEXES 0x2 #define _Py_CRITICAL_SECTION_MASK 0x3 #ifdef Py_GIL_DISABLED # define Py_BEGIN_CRITICAL_SECTION_MUT(mutex) \ { \ PyCriticalSection _py_cs; \ _PyCriticalSection_BeginMutex(&_py_cs, mutex) # define Py_BEGIN_CRITICAL_SECTION2_MUT(m1, m2) \ { \ PyCriticalSection2 _py_cs2; \ _PyCriticalSection2_BeginMutex(&_py_cs2, m1, m2) // Specialized version of critical section locking to safely use // PySequence_Fast APIs without the GIL. For performance, the argument to // PySequence_Fast() is provided to the macro, not the result of // PySequence_Fast(), which would require an extra test to determine if the // lock must be acquired. # define Py_BEGIN_CRITICAL_SECTION_SEQUENCE_FAST(original) \ { \ PyObject _orig_seq = _PyObject_CAST(original); \ const bool _should_lock_cs = PyList_CheckExact(_orig_seq); \ PyCriticalSection _cs; \ if (_should_lock_cs) { \ _PyCriticalSection_Begin(&_cs, _orig_seq); \ } # define Py_END_CRITICAL_SECTION_SEQUENCE_FAST() \ if (_should_lock_cs) { \ PyCriticalSection_End(&_cs); \ } \ } // Asserts that the mutex is locked. The mutex must be held by the // top-most critical section otherwise there's the possibility // that the mutex would be swalled out in some code paths. #define _Py_CRITICAL_SECTION_ASSERT_MUTEX_LOCKED(mutex) \ _PyCriticalSection_AssertHeld(mutex) // Asserts that the mutex for the given object is locked. The mutex must // be held by the top-most critical section otherwise there's the // possibility that the mutex would be swalled out in some code paths. #ifdef Py_DEBUG # define _Py_CRITICAL_SECTION_ASSERT_OBJECT_LOCKED(op) \ if (Py_REFCNT(op) != 1) { \ _Py_CRITICAL_SECTION_ASSERT_MUTEX_LOCKED(&_PyObject_CAST(op)->ob_mutex); \ } #else / Py_DEBUG / # define _Py_CRITICAL_SECTION_ASSERT_OBJECT_LOCKED(op) #endif / Py_DEBUG / #else / !Py_GIL_DISABLED / // The critical section APIs are no-ops with the GIL. # define Py_BEGIN_CRITICAL_SECTION_MUT(mut) { # define Py_BEGIN_CRITICAL_SECTION2_MUT(m1, m2) { # define Py_BEGIN_CRITICAL_SECTION_SEQUENCE_FAST(original) { # define Py_END_CRITICAL_SECTION_SEQUENCE_FAST() } # define _Py_CRITICAL_SECTION_ASSERT_MUTEX_LOCKED(mutex) # define _Py_CRITICAL_SECTION_ASSERT_OBJECT_LOCKED(op) #endif / !Py_GIL_DISABLED / // Resumes the top-most critical section. PyAPI_FUNC(void) _PyCriticalSection_Resume(PyThreadState tstate); // (private) slow path for locking the mutex PyAPI_FUNC(void) _PyCriticalSection_BeginSlow(PyCriticalSection c, PyMutex m); PyAPI_FUNC(void) _PyCriticalSection2_BeginSlow(PyCriticalSection2 c, PyMutex m1, PyMutex m2, int is_m1_locked); PyAPI_FUNC(void) _PyCriticalSection_SuspendAll(PyThreadState tstate); #ifdef Py_GIL_DISABLED static inline int _PyCriticalSection_IsActive(uintptr_t tag) { return tag != 0 && (tag & _Py_CRITICAL_SECTION_INACTIVE) == 0; } static inline void _PyCriticalSection_BeginMutex(PyCriticalSection c, PyMutex m) { if (PyMutex_LockFast(&m->_bits)) { PyThreadState tstate = _PyThreadState_GET(); c->_cs_mutex = m; c->_cs_prev = tstate->critical_section; tstate->critical_section = (uintptr_t)c; } else { _PyCriticalSection_BeginSlow(c, m); } } static inline void _PyCriticalSection_Begin(PyCriticalSection c, PyObject op) { _PyCriticalSection_BeginMutex(c, &op->ob_mutex); } #define PyCriticalSection_Begin _PyCriticalSection_Begin // Removes the top-most critical section from the thread's stack of critical // sections. If the new top-most critical section is inactive, then it is // resumed. static inline void _PyCriticalSection_Pop(PyCriticalSection c) { PyThreadState tstate = _PyThreadState_GET(); uintptr_t prev = c->_cs_prev; tstate->critical_section = prev; if ((prev & _Py_CRITICAL_SECTION_INACTIVE) != 0) { _PyCriticalSection_Resume(tstate); } } static inline void _PyCriticalSection_End(PyCriticalSection c) { PyMutex_Unlock(c->_cs_mutex); _PyCriticalSection_Pop(c); } #define PyCriticalSection_End _PyCriticalSection_End static inline void _PyCriticalSection2_BeginMutex(PyCriticalSection2 c, PyMutex m1, PyMutex m2) { if (m1 == m2) { // If the two mutex arguments are the same, treat this as a critical // section with a single mutex. c->_cs_mutex2 = NULL; _PyCriticalSection_BeginMutex(&c->_cs_base, m1); return; } if ((uintptr_t)m2 < (uintptr_t)m1) { // Sort the mutexes so that the lower address is locked first. // The exact order does not matter, but we need to acquire the mutexes // in a consistent order to avoid lock ordering deadlocks. PyMutex tmp = m1; m1 = m2; m2 = tmp; } if (PyMutex_LockFast(&m1->_bits)) { if (PyMutex_LockFast(&m2->_bits)) { PyThreadState tstate = _PyThreadState_GET(); c->_cs_base._cs_mutex = m1; c->_cs_mutex2 = m2; c->_cs_base._cs_prev = tstate->critical_section; uintptr_t p = (uintptr_t)c \| _Py_CRITICAL_SECTION_TWO_MUTEXES; tstate->critical_section = p; } else { _PyCriticalSection2_BeginSlow(c, m1, m2, 1); } } else { _PyCriticalSection2_BeginSlow(c, m1, m2, 0); } } static inline void _PyCriticalSection2_Begin(PyCriticalSection2 c, PyObject a, PyObject b) { _PyCriticalSection2_BeginMutex(c, &a->ob_mutex, &b->ob_mutex); } #define PyCriticalSection2_Begin _PyCriticalSection2_Begin static inline void _PyCriticalSection2_End(PyCriticalSection2 c) { if (c->_cs_mutex2) { PyMutex_Unlock(c->_cs_mutex2); } PyMutex_Unlock(c->_cs_base._cs_mutex); _PyCriticalSection_Pop(&c->_cs_base); } #define PyCriticalSection2_End _PyCriticalSection2_End static inline void _PyCriticalSection_AssertHeld(PyMutex mutex) { #ifdef Py_DEBUG PyThreadState tstate = _PyThreadState_GET(); uintptr_t prev = tstate->critical_section; if (prev & _Py_CRITICAL_SECTION_TWO_MUTEXES) { PyCriticalSection2 cs = (PyCriticalSection2 )(prev & ~_Py_CRITICAL_SECTION_MASK); assert(cs != NULL && (cs->_cs_base._cs_mutex == mutex \|\| cs->_cs_mutex2 == mutex)); } else { PyCriticalSection cs = (PyCriticalSection )(tstate->critical_section & ~_Py_CRITICAL_SECTION_MASK); assert(cs != NULL && cs->_cs_mutex == mutex); } #endif } #endif / Py_GIL_DISABLED / #ifdef __cplusplus } #endif #endif / !Py_INTERNAL_CRITICAL_SECTION_H */ Back

Edit File : pycore_critical_section.h | Size : 7.78 KB

#ifndef Py_INTERNAL_CRITICAL_SECTION_H
#define Py_INTERNAL_CRITICAL_SECTION_H

#ifndef Py_BUILD_CORE
#  error "this header requires Py_BUILD_CORE define"
#endif

#include "pycore_lock.h"        // PyMutex
#include "pycore_pystate.h"     // _PyThreadState_GET()
#include <stdint.h>

#ifdef __cplusplus
extern "C" {
#endif

// Tagged pointers to critical sections use the two least significant bits to
// mark if the pointed-to critical section is inactive and whether it is a
// PyCriticalSection2 object.
#define _Py_CRITICAL_SECTION_INACTIVE       0x1
#define _Py_CRITICAL_SECTION_TWO_MUTEXES    0x2
#define _Py_CRITICAL_SECTION_MASK           0x3

#ifdef Py_GIL_DISABLED
# define Py_BEGIN_CRITICAL_SECTION_MUT(mutex)                           \
    {                                                                   \
        PyCriticalSection _py_cs;                                       \
        _PyCriticalSection_BeginMutex(&_py_cs, mutex)

# define Py_BEGIN_CRITICAL_SECTION2_MUT(m1, m2)                         \
    {                                                                   \
        PyCriticalSection2 _py_cs2;                                     \
        _PyCriticalSection2_BeginMutex(&_py_cs2, m1, m2)

// Specialized version of critical section locking to safely use
// PySequence_Fast APIs without the GIL. For performance, the argument *to*
// PySequence_Fast() is provided to the macro, not the *result* of
// PySequence_Fast(), which would require an extra test to determine if the
// lock must be acquired.
# define Py_BEGIN_CRITICAL_SECTION_SEQUENCE_FAST(original)              \
    {                                                                   \
        PyObject *_orig_seq = _PyObject_CAST(original);                 \
        const bool _should_lock_cs = PyList_CheckExact(_orig_seq);      \
        PyCriticalSection _cs;                                          \
        if (_should_lock_cs) {                                          \
            _PyCriticalSection_Begin(&_cs, _orig_seq);                  \
        }

# define Py_END_CRITICAL_SECTION_SEQUENCE_FAST()                        \
        if (_should_lock_cs) {                                          \
            PyCriticalSection_End(&_cs);                                \
        }                                                               \
    }

// Asserts that the mutex is locked.  The mutex must be held by the
// top-most critical section otherwise there's the possibility
// that the mutex would be swalled out in some code paths.
#define _Py_CRITICAL_SECTION_ASSERT_MUTEX_LOCKED(mutex) \
    _PyCriticalSection_AssertHeld(mutex)

// Asserts that the mutex for the given object is locked. The mutex must
// be held by the top-most critical section otherwise there's the
// possibility that the mutex would be swalled out in some code paths.
#ifdef Py_DEBUG

# define _Py_CRITICAL_SECTION_ASSERT_OBJECT_LOCKED(op)                           \
    if (Py_REFCNT(op) != 1) {                                                    \
        _Py_CRITICAL_SECTION_ASSERT_MUTEX_LOCKED(&_PyObject_CAST(op)->ob_mutex); \
    }

#else   /* Py_DEBUG */

# define _Py_CRITICAL_SECTION_ASSERT_OBJECT_LOCKED(op)

#endif  /* Py_DEBUG */

#else  /* !Py_GIL_DISABLED */
// The critical section APIs are no-ops with the GIL.
# define Py_BEGIN_CRITICAL_SECTION_MUT(mut) {
# define Py_BEGIN_CRITICAL_SECTION2_MUT(m1, m2) {
# define Py_BEGIN_CRITICAL_SECTION_SEQUENCE_FAST(original) {
# define Py_END_CRITICAL_SECTION_SEQUENCE_FAST() }
# define _Py_CRITICAL_SECTION_ASSERT_MUTEX_LOCKED(mutex)
# define _Py_CRITICAL_SECTION_ASSERT_OBJECT_LOCKED(op)
#endif  /* !Py_GIL_DISABLED */

// Resumes the top-most critical section.
PyAPI_FUNC(void)
_PyCriticalSection_Resume(PyThreadState *tstate);

// (private) slow path for locking the mutex
PyAPI_FUNC(void)
_PyCriticalSection_BeginSlow(PyCriticalSection *c, PyMutex *m);

PyAPI_FUNC(void)
_PyCriticalSection2_BeginSlow(PyCriticalSection2 *c, PyMutex *m1, PyMutex *m2,
                             int is_m1_locked);

PyAPI_FUNC(void)
_PyCriticalSection_SuspendAll(PyThreadState *tstate);

#ifdef Py_GIL_DISABLED

static inline int
_PyCriticalSection_IsActive(uintptr_t tag)
{
    return tag != 0 && (tag & _Py_CRITICAL_SECTION_INACTIVE) == 0;
}

static inline void
_PyCriticalSection_BeginMutex(PyCriticalSection *c, PyMutex *m)
{
    if (PyMutex_LockFast(&m->_bits)) {
        PyThreadState *tstate = _PyThreadState_GET();
        c->_cs_mutex = m;
        c->_cs_prev = tstate->critical_section;
        tstate->critical_section = (uintptr_t)c;
    }
    else {
        _PyCriticalSection_BeginSlow(c, m);
    }
}

static inline void
_PyCriticalSection_Begin(PyCriticalSection *c, PyObject *op)
{
    _PyCriticalSection_BeginMutex(c, &op->ob_mutex);
}
#define PyCriticalSection_Begin _PyCriticalSection_Begin

// Removes the top-most critical section from the thread's stack of critical
// sections. If the new top-most critical section is inactive, then it is
// resumed.
static inline void
_PyCriticalSection_Pop(PyCriticalSection *c)
{
    PyThreadState *tstate = _PyThreadState_GET();
    uintptr_t prev = c->_cs_prev;
    tstate->critical_section = prev;

if ((prev & _Py_CRITICAL_SECTION_INACTIVE) != 0) {
        _PyCriticalSection_Resume(tstate);
    }
}

static inline void
_PyCriticalSection_End(PyCriticalSection *c)
{
    PyMutex_Unlock(c->_cs_mutex);
    _PyCriticalSection_Pop(c);
}
#define PyCriticalSection_End _PyCriticalSection_End

static inline void
_PyCriticalSection2_BeginMutex(PyCriticalSection2 *c, PyMutex *m1, PyMutex *m2)
{
    if (m1 == m2) {
        // If the two mutex arguments are the same, treat this as a critical
        // section with a single mutex.
        c->_cs_mutex2 = NULL;
        _PyCriticalSection_BeginMutex(&c->_cs_base, m1);
        return;
    }

if ((uintptr_t)m2 < (uintptr_t)m1) {
        // Sort the mutexes so that the lower address is locked first.
        // The exact order does not matter, but we need to acquire the mutexes
        // in a consistent order to avoid lock ordering deadlocks.
        PyMutex *tmp = m1;
        m1 = m2;
        m2 = tmp;
    }

if (PyMutex_LockFast(&m1->_bits)) {
        if (PyMutex_LockFast(&m2->_bits)) {
            PyThreadState *tstate = _PyThreadState_GET();
            c->_cs_base._cs_mutex = m1;
            c->_cs_mutex2 = m2;
            c->_cs_base._cs_prev = tstate->critical_section;

uintptr_t p = (uintptr_t)c | _Py_CRITICAL_SECTION_TWO_MUTEXES;
            tstate->critical_section = p;
        }
        else {
            _PyCriticalSection2_BeginSlow(c, m1, m2, 1);
        }
    }
    else {
        _PyCriticalSection2_BeginSlow(c, m1, m2, 0);
    }
}

static inline void
_PyCriticalSection2_Begin(PyCriticalSection2 *c, PyObject *a, PyObject *b)
{
    _PyCriticalSection2_BeginMutex(c, &a->ob_mutex, &b->ob_mutex);
}
#define PyCriticalSection2_Begin _PyCriticalSection2_Begin

static inline void
_PyCriticalSection2_End(PyCriticalSection2 *c)
{
    if (c->_cs_mutex2) {
        PyMutex_Unlock(c->_cs_mutex2);
    }
    PyMutex_Unlock(c->_cs_base._cs_mutex);
    _PyCriticalSection_Pop(&c->_cs_base);
}
#define PyCriticalSection2_End _PyCriticalSection2_End

static inline void
_PyCriticalSection_AssertHeld(PyMutex *mutex)
{
#ifdef Py_DEBUG
    PyThreadState *tstate = _PyThreadState_GET();
    uintptr_t prev = tstate->critical_section;
    if (prev & _Py_CRITICAL_SECTION_TWO_MUTEXES) {
        PyCriticalSection2 *cs = (PyCriticalSection2 *)(prev & ~_Py_CRITICAL_SECTION_MASK);
        assert(cs != NULL && (cs->_cs_base._cs_mutex == mutex || cs->_cs_mutex2 == mutex));
    }
    else {
        PyCriticalSection *cs = (PyCriticalSection *)(tstate->critical_section & ~_Py_CRITICAL_SECTION_MASK);
        assert(cs != NULL && cs->_cs_mutex == mutex);
    }

#endif
}

#endif /* Py_GIL_DISABLED */

#ifdef __cplusplus
}
#endif
#endif /* !Py_INTERNAL_CRITICAL_SECTION_H */

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