/* Thread module */

/* Interface to Sjoerd's portable C thread library */

#include "Python.h"

#ifndef WITH_THREAD

#error "Error!  The rest of Python is not compiled with thread support."

#error "Rerun configure, adding a --with-threads option."

#error "Then run `make clean' followed by `make'."

#endif

#include "pythread.h"

static PyObject *ThreadError;

/* Lock objects */

typedef struct {

	PyObject_HEAD

	PyThread_type_lock lock_lock;

} lockobject;

static void

lock_dealloc(lockobject *self)

{

	assert(self->lock_lock);

	/* Unlock the lock so it's safe to free it */

	PyThread_acquire_lock(self->lock_lock, 0);

	PyThread_release_lock(self->lock_lock);

	PyThread_free_lock(self->lock_lock);

	PyObject_Del(self);

}

static PyObject *

lock_PyThread_acquire_lock(lockobject *self, PyObject *args)

{

	int i = 1;

	if (!PyArg_ParseTuple(args, "|i:acquire", &i))

		return NULL;

	Py_BEGIN_ALLOW_THREADS

	i = PyThread_acquire_lock(self->lock_lock, i);

	Py_END_ALLOW_THREADS

	return PyBool_FromLong((long)i);

}

PyDoc_STRVAR(acquire_doc,

"acquire([wait]) -> None or bool\n\

(acquire_lock() is an obsolete synonym)\n\

\n\

Lock the lock.  Without argument, this blocks if the lock is already\n\

locked (even by the same thread), waiting for another thread to release\n\

the lock, and return None once the lock is acquired.\n\

With an argument, this will only block if the argument is true,\n\

and the return value reflects whether the lock is acquired.\n\

The blocking operation is not interruptible.");

static PyObject *

lock_PyThread_release_lock(lockobject *self)

{

	/* Sanity check: the lock must be locked */

	if (PyThread_acquire_lock(self->lock_lock, 0)) {

		PyThread_release_lock(self->lock_lock);

		PyErr_SetString(ThreadError, "release unlocked lock");

		return NULL;

	}

	PyThread_release_lock(self->lock_lock);

	Py_INCREF(Py_None);

	return Py_None;

}

PyDoc_STRVAR(release_doc,

"release()\n\

(release_lock() is an obsolete synonym)\n\

\n\

Release the lock, allowing another thread that is blocked waiting for\n\

the lock to acquire the lock.  The lock must be in the locked state,\n\

but it needn't be locked by the same thread that unlocks it.");

static PyObject *

lock_locked_lock(lockobject *self)

{

	if (PyThread_acquire_lock(self->lock_lock, 0)) {

		PyThread_release_lock(self->lock_lock);

		return PyBool_FromLong(0L);

	}

	return PyBool_FromLong(1L);

}

PyDoc_STRVAR(locked_doc,

"locked() -> bool\n\

(locked_lock() is an obsolete synonym)\n\

\n\

Return whether the lock is in the locked state.");

static PyMethodDef lock_methods[] = {

	{"acquire_lock", (PyCFunction)lock_PyThread_acquire_lock, 

	 METH_VARARGS, acquire_doc},

	{"acquire",      (PyCFunction)lock_PyThread_acquire_lock, 

	 METH_VARARGS, acquire_doc},

	{"release_lock", (PyCFunction)lock_PyThread_release_lock, 

	 METH_NOARGS, release_doc},

	{"release",      (PyCFunction)lock_PyThread_release_lock, 

	 METH_NOARGS, release_doc},

	{"locked_lock",  (PyCFunction)lock_locked_lock,  

	 METH_NOARGS, locked_doc},

	{"locked",       (PyCFunction)lock_locked_lock,  

	 METH_NOARGS, locked_doc},

	{"__enter__",    (PyCFunction)lock_PyThread_acquire_lock,

	 METH_VARARGS, acquire_doc},

	{"__exit__",    (PyCFunction)lock_PyThread_release_lock,

	 METH_VARARGS, release_doc},

	{NULL,           NULL}		/* sentinel */

};

static PyObject *

lock_getattr(lockobject *self, char *name)

{

	return Py_FindMethod(lock_methods, (PyObject *)self, name);

}

static PyTypeObject Locktype = {

	PyVarObject_HEAD_INIT(&PyType_Type, 0)

	"thread.lock",			/*tp_name*/

	sizeof(lockobject),		/*tp_size*/

	0,				/*tp_itemsize*/

	/* methods */

	(destructor)lock_dealloc,	/*tp_dealloc*/

	0,				/*tp_print*/

	(getattrfunc)lock_getattr,	/*tp_getattr*/

	0,				/*tp_setattr*/

	0,				/*tp_compare*/

	0,				/*tp_repr*/

};

static lockobject *

newlockobject(void)

{

	lockobject *self;

	self = PyObject_New(lockobject, &Locktype);

	if (self == NULL)

		return NULL;

	self->lock_lock = PyThread_allocate_lock();

	if (self->lock_lock == NULL) {

		PyObject_Del(self);

		self = NULL;

		PyErr_SetString(ThreadError, "can't allocate lock");

	}

	return self;

}

/* Thread-local objects */

#include "structmember.h"

typedef struct {

	PyObject_HEAD

	PyObject *key;

	PyObject *args;

	PyObject *kw;

	PyObject *dict;

} localobject;

static PyObject *

local_new(PyTypeObject *type, PyObject *args, PyObject *kw)

{

	localobject *self;

	PyObject *tdict;

	if (type->tp_init == PyBaseObject_Type.tp_init

	    && ((args && PyObject_IsTrue(args))

		|| (kw && PyObject_IsTrue(kw)))) {

		PyErr_SetString(PyExc_TypeError,

			  "Initialization arguments are not supported");

		return NULL;

	}

	self = (localobject *)type->tp_alloc(type, 0);

	if (self == NULL)

		return NULL;

	Py_XINCREF(args);

	self->args = args;

	Py_XINCREF(kw);

	self->kw = kw;

	self->dict = NULL;	/* making sure */

	self->key = PyString_FromFormat("thread.local.%p", self);

	if (self->key == NULL) 

		goto err;

	self->dict = PyDict_New();

	if (self->dict == NULL)

		goto err;

	tdict = PyThreadState_GetDict();

	if (tdict == NULL) {

		PyErr_SetString(PyExc_SystemError,

				"Couldn't get thread-state dictionary");

		goto err;

	}

	if (PyDict_SetItem(tdict, self->key, self->dict) < 0)

		goto err;

	return (PyObject *)self;

  err:

	Py_DECREF(self);

	return NULL;

}

static int

local_traverse(localobject *self, visitproc visit, void *arg)

{

	Py_VISIT(self->args);

	Py_VISIT(self->kw);

	Py_VISIT(self->dict);

	return 0;

}

static int

local_clear(localobject *self)

{

	Py_CLEAR(self->key);

	Py_CLEAR(self->args);

	Py_CLEAR(self->kw);

	Py_CLEAR(self->dict);

	return 0;

}

static void

local_dealloc(localobject *self)

{

	PyThreadState *tstate;

	if (self->key

	    && (tstate = PyThreadState_Get())

	    && tstate->interp) {

		for(tstate = PyInterpreterState_ThreadHead(tstate->interp);

		    tstate;

		    tstate = PyThreadState_Next(tstate)) 

			if (tstate->dict &&

			    PyDict_GetItem(tstate->dict, self->key))

				PyDict_DelItem(tstate->dict, self->key);

	}

	local_clear(self);

	Py_TYPE(self)->tp_free((PyObject*)self);

}

static PyObject *

_ldict(localobject *self)

{

	PyObject *tdict, *ldict;

	tdict = PyThreadState_GetDict();

	if (tdict == NULL) {

		PyErr_SetString(PyExc_SystemError,

				"Couldn't get thread-state dictionary");

		return NULL;

	}

	ldict = PyDict_GetItem(tdict, self->key);

	if (ldict == NULL) {

		ldict = PyDict_New(); /* we own ldict */

		if (ldict == NULL)

			return NULL;

		else {

			int i = PyDict_SetItem(tdict, self->key, ldict);

			Py_DECREF(ldict); /* now ldict is borrowed */

			if (i < 0) 

				return NULL;

		}

		Py_CLEAR(self->dict);

		Py_INCREF(ldict);

		self->dict = ldict; /* still borrowed */

		if (Py_TYPE(self)->tp_init != PyBaseObject_Type.tp_init &&

		    Py_TYPE(self)->tp_init((PyObject*)self, 

					   self->args, self->kw) < 0) {

			/* we need to get rid of ldict from thread so

			   we create a new one the next time we do an attr

			   acces */

			PyDict_DelItem(tdict, self->key);

			return NULL;

		}

	}

	/* The call to tp_init above may have caused another thread to run.

	   Install our ldict again. */

	if (self->dict != ldict) {

		Py_CLEAR(self->dict);

		Py_INCREF(ldict);

		self->dict = ldict;

	}

	return ldict;

}

static int

local_setattro(localobject *self, PyObject *name, PyObject *v)

{

	PyObject *ldict;

	ldict = _ldict(self);

	if (ldict == NULL) 

		return -1;

	return PyObject_GenericSetAttr((PyObject *)self, name, v);

}

static PyObject *

local_getdict(localobject *self, void *closure)

{

	if (self->dict == NULL) {

		PyErr_SetString(PyExc_AttributeError, "__dict__");

		return NULL;

	}

	Py_INCREF(self->dict);

	return self->dict;

}

static PyGetSetDef local_getset[] = {

	{"__dict__", (getter)local_getdict, (setter)NULL,

	 "Local-data dictionary", NULL},

	{NULL}  /* Sentinel */

};

static PyObject *local_getattro(localobject *, PyObject *);

static PyTypeObject localtype = {

	PyVarObject_HEAD_INIT(NULL, 0)

	/* tp_name           */ "thread._local",

	/* tp_basicsize      */ sizeof(localobject),

	/* tp_itemsize       */ 0,

	/* tp_dealloc        */ (destructor)local_dealloc,

	/* tp_print          */ 0,

	/* tp_getattr        */ 0,

	/* tp_setattr        */ 0,

	/* tp_compare        */ 0,

	/* tp_repr           */ 0,

	/* tp_as_number      */ 0,

	/* tp_as_sequence    */ 0,

	/* tp_as_mapping     */ 0,

	/* tp_hash           */ 0,

	/* tp_call           */ 0,

	/* tp_str            */ 0,

	/* tp_getattro       */ (getattrofunc)local_getattro,

	/* tp_setattro       */ (setattrofunc)local_setattro,

	/* tp_as_buffer      */ 0,

	/* tp_flags          */ Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE,

	/* tp_doc            */ "Thread-local data",

	/* tp_traverse       */ (traverseproc)local_traverse,

	/* tp_clear          */ (inquiry)local_clear,

	/* tp_richcompare    */ 0,

	/* tp_weaklistoffset */ 0,

	/* tp_iter           */ 0,

	/* tp_iternext       */ 0,

	/* tp_methods        */ 0,

	/* tp_members        */ 0,

	/* tp_getset         */ local_getset,

	/* tp_base           */ 0,

	/* tp_dict           */ 0, /* internal use */

	/* tp_descr_get      */ 0,

	/* tp_descr_set      */ 0,

	/* tp_dictoffset     */ offsetof(localobject, dict),

	/* tp_init           */ 0,

	/* tp_alloc          */ 0,

	/* tp_new            */ local_new,

	/* tp_free           */ 0, /* Low-level free-mem routine */

	/* tp_is_gc          */ 0, /* For PyObject_IS_GC */

};

static PyObject *

local_getattro(localobject *self, PyObject *name)

{

	PyObject *ldict, *value;

	ldict = _ldict(self);

	if (ldict == NULL) 

		return NULL;

	if (Py_TYPE(self) != &localtype)

		/* use generic lookup for subtypes */

		return PyObject_GenericGetAttr((PyObject *)self, name);

	/* Optimization: just look in dict ourselves */

	value = PyDict_GetItem(ldict, name);

	if (value == NULL) 

		/* Fall back on generic to get __class__ and __dict__ */

		return PyObject_GenericGetAttr((PyObject *)self, name);

	Py_INCREF(value);

	return value;

}

/* Module functions */

struct bootstate {

	PyInterpreterState *interp;

	PyObject *func;

	PyObject *args;

	PyObject *keyw;

};

static void

t_bootstrap(void *boot_raw)

{

	struct bootstate *boot = (struct bootstate *) boot_raw;

	PyThreadState *tstate;

	PyObject *res;

	tstate = PyThreadState_New(boot->interp);

	PyEval_AcquireThread(tstate);

	res = PyEval_CallObjectWithKeywords(

		boot->func, boot->args, boot->keyw);

	if (res == NULL) {

		if (PyErr_ExceptionMatches(PyExc_SystemExit))

			PyErr_Clear();

		else {

			PyObject *file;

			PySys_WriteStderr(

				"Unhandled exception in thread started by ");

			file = PySys_GetObject("stderr");

			if (file)

				PyFile_WriteObject(boot->func, file, 0);

			else

				PyObject_Print(boot->func, stderr, 0);

			PySys_WriteStderr("\n");

			PyErr_PrintEx(0);

		}

	}

	else

		Py_DECREF(res);

	Py_DECREF(boot->func);

	Py_DECREF(boot->args);

	Py_XDECREF(boot->keyw);

	PyMem_DEL(boot_raw);

	PyThreadState_Clear(tstate);

	PyThreadState_DeleteCurrent();

	PyThread_exit_thread();

}

static PyObject *

thread_PyThread_start_new_thread(PyObject *self, PyObject *fargs)

{

	PyObject *func, *args, *keyw = NULL;

	struct bootstate *boot;

	long ident;

	if (!PyArg_UnpackTuple(fargs, "start_new_thread", 2, 3,

		               &func, &args, &keyw))

		return NULL;

	if (!PyCallable_Check(func)) {

		PyErr_SetString(PyExc_TypeError,

				"first arg must be callable");

		return NULL;

	}

	if (!PyTuple_Check(args)) {

		PyErr_SetString(PyExc_TypeError,

				"2nd arg must be a tuple");

		return NULL;

	}

	if (keyw != NULL && !PyDict_Check(keyw)) {

		PyErr_SetString(PyExc_TypeError,

				"optional 3rd arg must be a dictionary");

		return NULL;

	}

	boot = PyMem_NEW(struct bootstate, 1);

	if (boot == NULL)

		return PyErr_NoMemory();

	boot->interp = PyThreadState_GET()->interp;

	boot->func = func;

	boot->args = args;

	boot->keyw = keyw;

	Py_INCREF(func);

	Py_INCREF(args);

	Py_XINCREF(keyw);

	PyEval_InitThreads(); /* Start the interpreter's thread-awareness */

	ident = PyThread_start_new_thread(t_bootstrap, (void*) boot);

	if (ident == -1) {

		PyErr_SetString(ThreadError, "can't start new thread");

		Py_DECREF(func);

		Py_DECREF(args);

		Py_XDECREF(keyw);

		PyMem_DEL(boot);

		return NULL;

	}

	return PyInt_FromLong(ident);

}

PyDoc_STRVAR(start_new_doc,

"start_new_thread(function, args[, kwargs])\n\

(start_new() is an obsolete synonym)\n\

\n\

Start a new thread and return its identifier.  The thread will call the\n\

function with positional arguments from the tuple args and keyword arguments\n\

taken from the optional dictionary kwargs.  The thread exits when the\n\

function returns; the return value is ignored.  The thread will also exit\n\

when the function raises an unhandled exception; a stack trace will be\n\

printed unless the exception is SystemExit.\n");

static PyObject *

thread_PyThread_exit_thread(PyObject *self)

{

	PyErr_SetNone(PyExc_SystemExit);

	return NULL;

}

PyDoc_STRVAR(exit_doc,

"exit()\n\

(PyThread_exit_thread() is an obsolete synonym)\n\

\n\

This is synonymous to ``raise SystemExit''.  It will cause the current\n\

thread to exit silently unless the exception is caught.");

static PyObject *

thread_PyThread_interrupt_main(PyObject * self)

{