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/*
* create.c
*
* Description:
* This translation unit implements routines associated with spawning a new
* thread.
*/
#include <windows.h>
#include <process.h>
#include "pthread.h"
#include "implement.h"
unsigned
_pthread_start_call(void *this)
{
/* We're now in a running thread. Any local variables here are on
this threads private stack so we're safe to leave data in them
until we leave. */
unsigned (*func)(void *) = this->call.routine;
void * arg = this->call.arg;
unsigned ret;
ret = (*func)(arg);
/* If we get to here then we're returning naturally and haven't
been cancelled. We need to cleanup and remove the thread
from the threads table. */
_pthread_vacuum();
return ret;
}
int
pthread_create(pthread_t *thread,
const pthread_attr_t *attr,
void * (*start_routine) (void *),
void * arg)
{
HANDLE handle = NULL;
unsigned flags;
void * security = NULL;
/* FIXME: This needs to be moved into process space.
Perhaps into a structure that contains all
per thread info that is Win32 thread specific but
not visible from the pthreads API, and
accessible through HANDLE (or pthread_t).
*/
SECURITY_ATTRIBUTES security_attr;
DWORD threadID;
/* Success unless otherwise set. */
int ret = 0;
pthread_attr_t * attr_copy;
_pthread_threads_thread_t * this;
/* CRITICAL SECTION */
pthread_mutex_lock(&_pthread_count_mutex);
if (_pthread_new_thread_entry((pthread_t) handle, &this) == 0)
{
attr_copy = &(this->attr);
if (attr != NULL)
{
/* Map attributes */
if (attr_copy->stacksize == 0)
{
attr_copy->stacksize = PTHREAD_STACK_MIN;
}
attr_copy->cancelability = attr->cancelability;
}
/* Start suspended and resume at the last moment to avoid
race conditions, ie. where a thread may enquire it's
attributes before we finish storing them away. */
flags = 1;
handle = (HANDLE) _beginthreadex(security,
attr_copy->stacksize,
_pthread_start_call,
(void *) this,
flags,
&threadID);
if (handle == NULL)
{
ret = EAGAIN;
}
}
else
{
ret = EAGAIN;
}
/* Let others in as soon as possible. */
pthread_mutex_unlock(&_pthread_count_mutex);
/* END CRITICAL SECTION */
if (ret == 0)
{
/* Let the caller know the thread handle. */
*thread = (pthread_t) handle;
/* POSIX threads are always running after creation. */
ResumeThread(handle);
}
else
{
/* Undo everything. */
_pthread_delete_thread_entry(this);
}
return ret;
}
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