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/* This code implemented by cvale@netcom.com */
#define INCL_DOSPROCESS
#define INCL_DOSSEMAPHORES
#include "os2.h"
#include "limits.h"
#include "process.h"
long PyThread_get_thread_ident(void);
/*
* Initialization of the C package, should not be needed.
*/
static void
PyThread__init_thread(void)
{
}
/*
* Thread support.
*/
long
PyThread_start_new_thread(void (*func)(void *), void *arg)
{
int aThread;
int success = 0;
aThread = _beginthread(func,NULL,65536,arg);
if( aThread == -1 ) {
success = -1;
fprintf(stderr,"aThread failed == %d",aThread);
dprintf(("_beginthread failed. return %ld\n", errno));
}
return success;
}
long
PyThread_get_thread_ident(void)
{
PPIB pib;
PTIB tib;
if (!initialized)
PyThread_init_thread();
DosGetInfoBlocks(&tib,&pib);
return tib->tib_ptib2->tib2_ultid;
}
static void
do_PyThread_exit_thread(int no_cleanup)
{
dprintf(("%ld: PyThread_exit_thread called\n", PyThread_get_thread_ident()));
if (!initialized)
if (no_cleanup)
_exit(0);
else
exit(0);
_endthread();
}
void
PyThread_exit_thread(void)
{
do_PyThread_exit_thread(0);
}
void
PyThread__exit_thread(void)
{
do_PyThread_exit_thread(1);
}
#ifndef NO_EXIT_PROG
static void
do_PyThread_exit_prog(int status, int no_cleanup)
{
dprintf(("PyThread_exit_prog(%d) called\n", status));
if (!initialized)
if (no_cleanup)
_exit(status);
else
exit(status);
}
void
PyThread_exit_prog(int status)
{
do_PyThread_exit_prog(status, 0);
}
void
PyThread__exit_prog(int status)
{
do_PyThread_exit_prog(status, 1);
}
#endif /* NO_EXIT_PROG */
/*
* Lock support. This is implemented with an event semaphore and critical
* sections to make it behave more like a posix mutex than its OS/2
# counterparts.
*/
typedef struct os2_lock_t {
int is_set;
HEV changed;
} *type_os2_lock;
PyThread_type_lock
PyThread_allocate_lock(void)
{
APIRET rc;
type_os2_lock lock = (type_os2_lock)malloc(sizeof(struct os2_lock_t));
dprintf(("PyThread_allocate_lock called\n"));
if (!initialized)
PyThread_init_thread();
lock->is_set = 0;
DosCreateEventSem(NULL, &lock->changed, 0, 0);
dprintf(("%ld: PyThread_allocate_lock() -> %p\n",
PyThread_get_thread_ident(),
lock->changed));
return (PyThread_type_lock) lock;
}
void
PyThread_free_lock(PyThread_type_lock aLock)
{
type_os2_lock lock = (type_os2_lock)aLock;
dprintf(("%ld: PyThread_free_lock(%p) called\n", PyThread_get_thread_ident(),aLock));
DosCloseEventSem(lock->changed);
free(aLock);
}
/*
* Return 1 on success if the lock was acquired
*
* and 0 if the lock was not acquired.
*/
int
PyThread_acquire_lock(PyThread_type_lock aLock, int waitflag)
{
int done = 0;
ULONG count;
PID pid = 0;
TID tid = 0;
type_os2_lock lock = (type_os2_lock)aLock;
dprintf(("%ld: PyThread_acquire_lock(%p, %d) called\n", PyThread_get_thread_ident(),
aLock, waitflag));
while (!done) {
/* if the lock is currently set, we have to wait for the state to change */
if (lock->is_set) {
if (!waitflag)
return 0;
DosWaitEventSem(lock->changed, SEM_INDEFINITE_WAIT);
}
/*
* enter a critical section and try to get the semaphore. If
* it is still locked, we will try again.
*/
if (DosEnterCritSec())
return 0;
if (!lock->is_set) {
lock->is_set = 1;
DosResetEventSem(lock->changed, &count);
done = 1;
}
DosExitCritSec();
}
return 1;
}
void PyThread_release_lock(PyThread_type_lock aLock)
{
type_os2_lock lock = (type_os2_lock)aLock;
dprintf(("%ld: PyThread_release_lock(%p) called\n", PyThread_get_thread_ident(),aLock));
if (!lock->is_set) {
dprintf(("%ld: Could not PyThread_release_lock(%p) error: %l\n",
PyThread_get_thread_ident(), aLock, GetLastError()));
return;
}
if (DosEnterCritSec()) {
dprintf(("%ld: Could not PyThread_release_lock(%p) error: %l\n",
PyThread_get_thread_ident(), aLock, GetLastError()));
return;
}
lock->is_set = 0;
DosPostEventSem(lock->changed);
DosExitCritSec();
}
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