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thread_os2.h
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267 lines (224 loc) · 5.7 KB
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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"
#if defined(PYCC_GCC)
#include <sys/builtin.h>
#include <sys/fmutex.h>
#else
long PyThread_get_thread_ident(void);
#endif
/* default thread stack size of 64kB */
#if !defined(THREAD_STACK_SIZE)
#define THREAD_STACK_SIZE 0x10000
#endif
#define OS2_STACKSIZE(x) (x ? x : THREAD_STACK_SIZE)
/*
* 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 thread_id;
thread_id = _beginthread(func,
NULL,
OS2_STACKSIZE(_pythread_stacksize),
arg);
if (thread_id == -1) {
dprintf(("_beginthread failed. return %ld\n", errno));
}
return thread_id;
}
long
PyThread_get_thread_ident(void)
{
#if !defined(PYCC_GCC)
PPIB pib;
PTIB tib;
#endif
if (!initialized)
PyThread_init_thread();
#if defined(PYCC_GCC)
return _gettid();
#else
DosGetInfoBlocks(&tib, &pib);
return tib->tib_ptib2->tib2_ultid;
#endif
}
void
PyThread_exit_thread(void)
{
dprintf(("%ld: PyThread_exit_thread called\n",
PyThread_get_thread_ident()));
if (!initialized)
exit(0);
_endthread();
}
/*
* 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)
{
#if defined(PYCC_GCC)
_fmutex *sem = malloc(sizeof(_fmutex));
if (!initialized)
PyThread_init_thread();
dprintf(("%ld: PyThread_allocate_lock() -> %lx\n",
PyThread_get_thread_ident(),
(long)sem));
if (_fmutex_create(sem, 0)) {
free(sem);
sem = NULL;
}
return (PyThread_type_lock)sem;
#else
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;
#endif
}
void
PyThread_free_lock(PyThread_type_lock aLock)
{
#if !defined(PYCC_GCC)
type_os2_lock lock = (type_os2_lock)aLock;
#endif
dprintf(("%ld: PyThread_free_lock(%p) called\n",
PyThread_get_thread_ident(),aLock));
#if defined(PYCC_GCC)
if (aLock) {
_fmutex_close((_fmutex *)aLock);
free((_fmutex *)aLock);
}
#else
DosCloseEventSem(lock->changed);
free(aLock);
#endif
}
/*
* 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)
{
#if !defined(PYCC_GCC)
int done = 0;
ULONG count;
PID pid = 0;
TID tid = 0;
type_os2_lock lock = (type_os2_lock)aLock;
#endif
dprintf(("%ld: PyThread_acquire_lock(%p, %d) called\n",
PyThread_get_thread_ident(),
aLock,
waitflag));
#if defined(PYCC_GCC)
/* always successful if the lock doesn't exist */
if (aLock &&
_fmutex_request((_fmutex *)aLock, waitflag ? 0 : _FMR_NOWAIT))
return 0;
#else
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();
}
#endif
return 1;
}
void
PyThread_release_lock(PyThread_type_lock aLock)
{
#if !defined(PYCC_GCC)
type_os2_lock lock = (type_os2_lock)aLock;
#endif
dprintf(("%ld: PyThread_release_lock(%p) called\n",
PyThread_get_thread_ident(),
aLock));
#if defined(PYCC_GCC)
if (aLock)
_fmutex_release((_fmutex *)aLock);
#else
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();
#endif
}
/* minimum/maximum thread stack sizes supported */
#define THREAD_MIN_STACKSIZE 0x8000 /* 32kB */
#define THREAD_MAX_STACKSIZE 0x2000000 /* 32MB */
/* set the thread stack size.
* Return 0 if size is valid, -1 otherwise.
*/
static int
_pythread_os2_set_stacksize(size_t size)
{
/* set to default */
if (size == 0) {
_pythread_stacksize = 0;
return 0;
}
/* valid range? */
if (size >= THREAD_MIN_STACKSIZE && size < THREAD_MAX_STACKSIZE) {
_pythread_stacksize = size;
return 0;
}
return -1;
}
#define THREAD_SET_STACKSIZE(x) _pythread_os2_set_stacksize(x)