summaryrefslogtreecommitdiffstats
path: root/Python/thread_os2.h
blob: 69bcd2ce504ff539a230b199dad09f11453ceb9e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
/* 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

/*
 * 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)
{
#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
}

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)
{
#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
}