2 /* GNU pth threads interface
3 http://www.gnu.org/software/pth
4 2000-05-03 Andy Dustman <andy@dustman.net>
6 Adapted from Posix threads interface
7 12 May 1997 -- david arnold <davida@pobox.com>
14 /* A pth mutex isn't sufficient to model the Python lock type
15 * because pth mutexes can be acquired multiple times by the
18 * The pth_lock struct implements a Python lock as a "locked?" bit
19 * and a <condition, mutex> pair. In general, if the bit can be acquired
20 * instantly, it is, else the pair is used to block the thread until the
25 char locked; /* 0=unlocked, 1=locked */
26 /* a <cond, mutex> pair to handle an acquire of a locked lock */
27 pth_cond_t lock_released;
31 #define CHECK_STATUS(name) if (status == -1) { printf("%d ", status); perror(name); error = 1; }
33 pth_attr_t PyThread_attr;
39 static void PyThread__init_thread(void)
42 PyThread_attr = pth_attr_new();
43 pth_attr_set(PyThread_attr, PTH_ATTR_STACK_SIZE, 1<<18);
44 pth_attr_set(PyThread_attr, PTH_ATTR_JOINABLE, FALSE);
52 long PyThread_start_new_thread(void (*func)(void *), void *arg)
55 dprintf(("PyThread_start_new_thread called\n"));
57 PyThread_init_thread();
59 th = pth_spawn(PyThread_attr,
60 (void* (*)(void *))func,
67 long PyThread_get_thread_ident(void)
69 volatile pth_t threadid;
71 PyThread_init_thread();
72 /* Jump through some hoops for Alpha OSF/1 */
73 threadid = pth_self();
74 return (long) *(long *) &threadid;
77 static void do_PyThread_exit_thread(int no_cleanup)
79 dprintf(("PyThread_exit_thread called\n"));
88 void PyThread_exit_thread(void)
90 do_PyThread_exit_thread(0);
93 void PyThread__exit_thread(void)
95 do_PyThread_exit_thread(1);
99 static void do_PyThread_exit_prog(int status, int no_cleanup)
101 dprintf(("PyThread_exit_prog(%d) called\n", status));
109 void PyThread_exit_prog(int status)
111 do_PyThread_exit_prog(status, 0);
114 void PyThread__exit_prog(int status)
116 do_PyThread_exit_prog(status, 1);
118 #endif /* NO_EXIT_PROG */
123 PyThread_type_lock PyThread_allocate_lock(void)
126 int status, error = 0;
128 dprintf(("PyThread_allocate_lock called\n"));
130 PyThread_init_thread();
132 lock = (pth_lock *) malloc(sizeof(pth_lock));
133 memset((void *)lock, '\0', sizeof(pth_lock));
136 status = pth_mutex_init(&lock->mut);
137 CHECK_STATUS("pth_mutex_init");
138 status = pth_cond_init(&lock->lock_released);
139 CHECK_STATUS("pth_cond_init");
145 dprintf(("PyThread_allocate_lock() -> %p\n", lock));
146 return (PyThread_type_lock) lock;
149 void PyThread_free_lock(PyThread_type_lock lock)
151 pth_lock *thelock = (pth_lock *)lock;
153 dprintf(("PyThread_free_lock(%p) called\n", lock));
155 free((void *)thelock);
158 int PyThread_acquire_lock(PyThread_type_lock lock, int waitflag)
161 pth_lock *thelock = (pth_lock *)lock;
162 int status, error = 0;
164 dprintf(("PyThread_acquire_lock(%p, %d) called\n", lock, waitflag));
166 status = pth_mutex_acquire(&thelock->mut, !waitflag, NULL);
167 CHECK_STATUS("pth_mutex_acquire[1]");
168 success = thelock->locked == 0;
169 if (success) thelock->locked = 1;
170 status = pth_mutex_release( &thelock->mut );
171 CHECK_STATUS("pth_mutex_release[1]");
173 if ( !success && waitflag ) {
174 /* continue trying until we get the lock */
176 /* mut must be locked by me -- part of the condition
178 status = pth_mutex_acquire( &thelock->mut, !waitflag, NULL );
179 CHECK_STATUS("pth_mutex_acquire[2]");
180 while ( thelock->locked ) {
181 status = pth_cond_await(&thelock->lock_released,
182 &thelock->mut, NULL);
183 CHECK_STATUS("pth_cond_await");
186 status = pth_mutex_release( &thelock->mut );
187 CHECK_STATUS("pth_mutex_release[2]");
190 if (error) success = 0;
191 dprintf(("PyThread_acquire_lock(%p, %d) -> %d\n", lock, waitflag, success));
195 void PyThread_release_lock(PyThread_type_lock lock)
197 pth_lock *thelock = (pth_lock *)lock;
198 int status, error = 0;
200 dprintf(("PyThread_release_lock(%p) called\n", lock));
202 status = pth_mutex_acquire( &thelock->mut, 0, NULL );
203 CHECK_STATUS("pth_mutex_acquire[3]");
207 status = pth_mutex_release( &thelock->mut );
208 CHECK_STATUS("pth_mutex_release[3]");
210 /* wake up someone (anyone, if any) waiting on the lock */
211 status = pth_cond_notify( &thelock->lock_released, 0 );
212 CHECK_STATUS("pth_cond_notify");