OU
/
CWE-ou-minkata
mirror of https://foundry.openuru.org/gitblit/r/CWE-ou-minkata.git
2
1
Fork 0
Code Releases Activity
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
55 Commits
79 Branches
23 Tags
171 MiB
 
 
 
 
 
Tree: 1cac4f85da
Branches Tags
${ item.name }
Create tag ${ searchTerm }
Create branch ${ searchTerm }
from '1cac4f85da'
${ noResults }
CWE-ou-minkata/MOULOpenSourceClientPlugin/Plasma20/SDKs/XPlatform/Cypython-2.3.3/Python/pystate.c

483 lines
12 KiB
Raw Blame History

/* Thread and interpreter state structures and their interfaces */
#include "Python.h"
#ifdef HAVE_DLOPEN
#ifdef HAVE_DLFCN_H
#include <dlfcn.h>
#endif
#ifndef RTLD_LAZY
#define RTLD_LAZY 1
#endif
#endif
#define ZAP(x) { \
PyObject *tmp = (PyObject *)(x); \
(x) = NULL; \
Py_XDECREF(tmp); \
}
#ifdef WITH_THREAD
#include "pythread.h"
static PyThread_type_lock head_mutex = NULL; /* Protects interp->tstate_head */
#define HEAD_INIT() (void)(head_mutex || (head_mutex = PyThread_allocate_lock()))
#define HEAD_LOCK() PyThread_acquire_lock(head_mutex, WAIT_LOCK)
#define HEAD_UNLOCK() PyThread_release_lock(head_mutex)
#else
#define HEAD_INIT() /* Nothing */
#define HEAD_LOCK() /* Nothing */
#define HEAD_UNLOCK() /* Nothing */
#endif
static PyInterpreterState *interp_head = NULL;
PyThreadState *_PyThreadState_Current = NULL;
PyThreadFrameGetter _PyThreadState_GetFrame = NULL;
PyInterpreterState *
PyInterpreterState_New(void)
{
PyInterpreterState *interp = PyMem_NEW(PyInterpreterState, 1);
if (interp != NULL) {
HEAD_INIT();
interp->modules = NULL;
interp->sysdict = NULL;
interp->builtins = NULL;
interp->tstate_head = NULL;
interp->codec_search_path = NULL;
interp->codec_search_cache = NULL;
interp->codec_error_registry = NULL;
#ifdef HAVE_DLOPEN
#ifdef RTLD_NOW
interp->dlopenflags = RTLD_NOW;
#else
interp->dlopenflags = RTLD_LAZY;
#endif
#endif
HEAD_LOCK();
interp->next = interp_head;
interp_head = interp;
HEAD_UNLOCK();
}
return interp;
}
void
PyInterpreterState_Clear(PyInterpreterState *interp)
{
PyThreadState *p;
HEAD_LOCK();
for (p = interp->tstate_head; p != NULL; p = p->next)
PyThreadState_Clear(p);
HEAD_UNLOCK();
ZAP(interp->codec_search_path);
ZAP(interp->codec_search_cache);
ZAP(interp->codec_error_registry);
ZAP(interp->modules);
ZAP(interp->sysdict);
ZAP(interp->builtins);
}
static void
zapthreads(PyInterpreterState *interp)
{
PyThreadState *p;
/* No need to lock the mutex here because this should only happen
when the threads are all really dead (XXX famous last words). */
while ((p = interp->tstate_head) != NULL) {
PyThreadState_Delete(p);
}
}
void
PyInterpreterState_Delete(PyInterpreterState *interp)
{
PyInterpreterState **p;
zapthreads(interp);
HEAD_LOCK();
for (p = &interp_head; ; p = &(*p)->next) {
if (*p == NULL)
Py_FatalError(
"PyInterpreterState_Delete: invalid interp");
if (*p == interp)
break;
}
if (interp->tstate_head != NULL)
Py_FatalError("PyInterpreterState_Delete: remaining threads");
*p = interp->next;
HEAD_UNLOCK();
PyMem_DEL(interp);
}
/* Default implementation for _PyThreadState_GetFrame */
static struct _frame *
threadstate_getframe(PyThreadState *self)
{
return self->frame;
}
PyThreadState *
PyThreadState_New(PyInterpreterState *interp)
{
PyThreadState *tstate = PyMem_NEW(PyThreadState, 1);
if (_PyThreadState_GetFrame == NULL)
_PyThreadState_GetFrame = threadstate_getframe;
if (tstate != NULL) {
tstate->interp = interp;
tstate->frame = NULL;
tstate->recursion_depth = 0;
tstate->tracing = 0;
tstate->use_tracing = 0;
tstate->tick_counter = 0;
tstate->gilstate_counter = 0;
tstate->async_exc = NULL;
#ifdef WITH_THREAD
tstate->thread_id = PyThread_get_thread_ident();
#else
tstate->thread_id = 0;
#endif
tstate->dict = NULL;
tstate->curexc_type = NULL;
tstate->curexc_value = NULL;
tstate->curexc_traceback = NULL;
tstate->exc_type = NULL;
tstate->exc_value = NULL;
tstate->exc_traceback = NULL;
tstate->c_profilefunc = NULL;
tstate->c_tracefunc = NULL;
tstate->c_profileobj = NULL;
tstate->c_traceobj = NULL;
HEAD_LOCK();
tstate->next = interp->tstate_head;
interp->tstate_head = tstate;
HEAD_UNLOCK();
}
return tstate;
}
void
PyThreadState_Clear(PyThreadState *tstate)
{
if (Py_VerboseFlag && tstate->frame != NULL)
fprintf(stderr,
"PyThreadState_Clear: warning: thread still has a frame\n");
ZAP(tstate->frame);
ZAP(tstate->dict);
ZAP(tstate->async_exc);
ZAP(tstate->curexc_type);
ZAP(tstate->curexc_value);
ZAP(tstate->curexc_traceback);
ZAP(tstate->exc_type);
ZAP(tstate->exc_value);
ZAP(tstate->exc_traceback);
tstate->c_profilefunc = NULL;
tstate->c_tracefunc = NULL;
ZAP(tstate->c_profileobj);
ZAP(tstate->c_traceobj);
}
/* Common code for PyThreadState_Delete() and PyThreadState_DeleteCurrent() */
static void
tstate_delete_common(PyThreadState *tstate)
{
PyInterpreterState *interp;
PyThreadState **p;
if (tstate == NULL)
Py_FatalError("PyThreadState_Delete: NULL tstate");
interp = tstate->interp;
if (interp == NULL)
Py_FatalError("PyThreadState_Delete: NULL interp");
HEAD_LOCK();
for (p = &interp->tstate_head; ; p = &(*p)->next) {
if (*p == NULL)
Py_FatalError(
"PyThreadState_Delete: invalid tstate");
if (*p == tstate)
break;
}
*p = tstate->next;
HEAD_UNLOCK();
PyMem_DEL(tstate);
}
void
PyThreadState_Delete(PyThreadState *tstate)
{
if (tstate == _PyThreadState_Current)
Py_FatalError("PyThreadState_Delete: tstate is still current");
tstate_delete_common(tstate);
}
#ifdef WITH_THREAD
void
PyThreadState_DeleteCurrent()
{
PyThreadState *tstate = _PyThreadState_Current;
if (tstate == NULL)
Py_FatalError(
"PyThreadState_DeleteCurrent: no current tstate");
_PyThreadState_Current = NULL;
tstate_delete_common(tstate);
PyEval_ReleaseLock();
}
#endif /* WITH_THREAD */
PyThreadState *
PyThreadState_Get(void)
{
if (_PyThreadState_Current == NULL)
Py_FatalError("PyThreadState_Get: no current thread");
return _PyThreadState_Current;
}
PyThreadState *
PyThreadState_Swap(PyThreadState *new)
{
PyThreadState *old = _PyThreadState_Current;
_PyThreadState_Current = new;
/* It should not be possible for more than one thread state
to be used for a thread. Check this the best we can in debug
builds.
*/
#if defined(Py_DEBUG) && defined(WITH_THREAD)
if (new) {
PyThreadState *check = PyGILState_GetThisThreadState();
if (check && check != new)
Py_FatalError("Invalid thread state for this thread");
}
#endif
return old;
}
/* An extension mechanism to store arbitrary additional per-thread state.
PyThreadState_GetDict() returns a dictionary that can be used to hold such
state; the caller should pick a unique key and store its state there. If
PyThreadState_GetDict() returns NULL, an exception has *not* been raised
and the caller should assume no per-thread state is available. */
PyObject *
PyThreadState_GetDict(void)
{
if (_PyThreadState_Current == NULL)
return NULL;
if (_PyThreadState_Current->dict == NULL) {
PyObject *d;
_PyThreadState_Current->dict = d = PyDict_New();
if (d == NULL)
PyErr_Clear();
}
return _PyThreadState_Current->dict;
}
/* Asynchronously raise an exception in a thread.
Requested by Just van Rossum and Alex Martelli.
To prevent naive misuse, you must write your own exception
to call this. Must be called with the GIL held.
Returns the number of tstates modified; if it returns a number
greater than one, you're in trouble, and you should call it again
with exc=NULL to revert the effect. This raises no exceptions. */
int
PyThreadState_SetAsyncExc(long id, PyObject *exc) {
PyThreadState *tstate = PyThreadState_Get();
PyInterpreterState *interp = tstate->interp;
PyThreadState *p;
int count = 0;
for (p = interp->tstate_head; p != NULL; p = p->next) {
if (p->thread_id != id)
continue;
ZAP(p->async_exc);
Py_XINCREF(exc);
p->async_exc = exc;
count += 1;
}
return count;
}
/* Routines for advanced debuggers, requested by David Beazley.
Don't use unless you know what you are doing! */
PyInterpreterState *
PyInterpreterState_Head(void)
{
return interp_head;
}
PyInterpreterState *
PyInterpreterState_Next(PyInterpreterState *interp) {
return interp->next;
}
PyThreadState *
PyInterpreterState_ThreadHead(PyInterpreterState *interp) {
return interp->tstate_head;
}
PyThreadState *
PyThreadState_Next(PyThreadState *tstate) {
return tstate->next;
}
/* Python "auto thread state" API. */
#ifdef WITH_THREAD
/* Keep this as a static, as it is not reliable! It can only
ever be compared to the state for the *current* thread.
* If not equal, then it doesn't matter that the actual
value may change immediately after comparison, as it can't
possibly change to the current thread's state.
* If equal, then the current thread holds the lock, so the value can't
change until we yield the lock.
*/
static int
PyThreadState_IsCurrent(PyThreadState *tstate)
{
/* Must be the tstate for this thread */
assert(PyGILState_GetThisThreadState()==tstate);
/* On Windows at least, simple reads and writes to 32 bit values
are atomic.
*/
return tstate == _PyThreadState_Current;
}
/* The single PyInterpreterState used by this process'
GILState implementation
*/
static PyInterpreterState *autoInterpreterState = NULL;
static int autoTLSkey = 0;
/* Internal initialization/finalization functions called by
Py_Initialize/Py_Finalize
*/
void _PyGILState_Init(PyInterpreterState *i, PyThreadState *t)
{
assert(i && t); /* must init with a valid states */
autoTLSkey = PyThread_create_key();
autoInterpreterState = i;
/* Now stash the thread state for this thread in TLS */
PyThread_set_key_value(autoTLSkey, (void *)t);
assert(t->gilstate_counter==0); /* must be a new thread state */
t->gilstate_counter = 1;
}
void _PyGILState_Fini(void)
{
PyThread_delete_key(autoTLSkey);
autoTLSkey = 0;
autoInterpreterState = NULL;;
}
/* The public functions */
PyThreadState *PyGILState_GetThisThreadState(void)
{
if (autoInterpreterState==NULL || autoTLSkey==0)
return NULL;
return (PyThreadState *) PyThread_get_key_value(autoTLSkey);
}
PyGILState_STATE PyGILState_Ensure(void)
{
int current;
PyThreadState *tcur;
/* Note that we do not auto-init Python here - apart from
potential races with 2 threads auto-initializing, pep-311
spells out other issues. Embedders are expected to have
called Py_Initialize() and usually PyEval_InitThreads().
*/
assert(autoInterpreterState); /* Py_Initialize() hasn't been called! */
tcur = PyThread_get_key_value(autoTLSkey);
if (tcur==NULL) {
/* Create a new thread state for this thread */
tcur = PyThreadState_New(autoInterpreterState);
if (tcur==NULL)
Py_FatalError("Couldn't create thread-state for new thread");
PyThread_set_key_value(autoTLSkey, (void *)tcur);
current = 0; /* new thread state is never current */
} else
current = PyThreadState_IsCurrent(tcur);
if (!current)
PyEval_RestoreThread(tcur);
/* Update our counter in the thread-state - no need for locks:
- tcur will remain valid as we hold the GIL.
- the counter is safe as we are the only thread "allowed"
to modify this value
*/
tcur->gilstate_counter++;
return current ? PyGILState_LOCKED : PyGILState_UNLOCKED;
}
void PyGILState_Release(PyGILState_STATE oldstate)
{
PyThreadState *tcur = PyThread_get_key_value(autoTLSkey);
if (tcur==NULL)
Py_FatalError("auto-releasing thread-state, "
"but no thread-state for this thread");
/* We must hold the GIL and have our thread state current */
/* XXX - remove the check - the assert should be fine,
but while this is very new (April 2003), the extra check
by release-only users can't hurt.
*/
if (!PyThreadState_IsCurrent(tcur))
Py_FatalError("This thread state must be current when releasing");
assert (PyThreadState_IsCurrent(tcur));
tcur->gilstate_counter -= 1;
assert (tcur->gilstate_counter >= 0); /* illegal counter value */
/* If we are about to destroy this thread-state, we must
clear it while the lock is held, as destructors may run
*/
if (tcur->gilstate_counter==0) {
/* can't have been locked when we created it */
assert(oldstate==PyGILState_UNLOCKED);
PyThreadState_Clear(tcur);
}
/* Release the lock if necessary */
if (oldstate==PyGILState_UNLOCKED)
PyEval_ReleaseThread(tcur);
/* Now complete destruction of the thread if necessary */
if (tcur->gilstate_counter==0) {
/* Delete this thread from our TLS */
PyThread_delete_key_value(autoTLSkey);
/* Delete the thread-state */
PyThreadState_Delete(tcur);
}
}
#endif /* WITH_THREAD */