mirror of
https://github.com/python/cpython.git
synced 2024-12-11 18:53:56 +08:00
f95a1b3c53
svn+ssh://pythondev@svn.python.org/python/trunk ........ r81029 | antoine.pitrou | 2010-05-09 16:46:46 +0200 (dim., 09 mai 2010) | 3 lines Untabify C files. Will watch buildbots. ........
260 lines
8.0 KiB
C
260 lines
8.0 KiB
C
|
|
#include <stdlib.h>
|
|
#include <stdio.h>
|
|
#include <signal.h>
|
|
#include <sys/types.h>
|
|
#include <sys/wait.h>
|
|
#include <sys/prctl.h>
|
|
#include <ulocks.h>
|
|
#include <errno.h>
|
|
|
|
#define HDR_SIZE 2680 /* sizeof(ushdr_t) */
|
|
#define MAXPROC 100 /* max # of threads that can be started */
|
|
|
|
static usptr_t *shared_arena;
|
|
static ulock_t count_lock; /* protection for some variables */
|
|
static ulock_t wait_lock; /* lock used to wait for other threads */
|
|
static int waiting_for_threads; /* protected by count_lock */
|
|
static int nthreads; /* protected by count_lock */
|
|
static int exit_status;
|
|
static int exiting; /* we're already exiting (for maybe_exit) */
|
|
static pid_t my_pid; /* PID of main thread */
|
|
static struct pidlist {
|
|
pid_t parent;
|
|
pid_t child;
|
|
} pidlist[MAXPROC]; /* PIDs of other threads; protected by count_lock */
|
|
static int maxpidindex; /* # of PIDs in pidlist */
|
|
/*
|
|
* Initialization.
|
|
*/
|
|
static void PyThread__init_thread(void)
|
|
{
|
|
#ifdef USE_DL
|
|
long addr, size;
|
|
#endif /* USE_DL */
|
|
|
|
|
|
#ifdef USE_DL
|
|
if ((size = usconfig(CONF_INITSIZE, 64*1024)) < 0)
|
|
perror("usconfig - CONF_INITSIZE (check)");
|
|
if (usconfig(CONF_INITSIZE, size) < 0)
|
|
perror("usconfig - CONF_INITSIZE (reset)");
|
|
addr = (long) dl_getrange(size + HDR_SIZE);
|
|
dprintf(("trying to use addr %p-%p for shared arena\n", addr, addr+size));
|
|
errno = 0;
|
|
if ((addr = usconfig(CONF_ATTACHADDR, addr)) < 0 && errno != 0)
|
|
perror("usconfig - CONF_ATTACHADDR (set)");
|
|
#endif /* USE_DL */
|
|
if (usconfig(CONF_INITUSERS, 16) < 0)
|
|
perror("usconfig - CONF_INITUSERS");
|
|
my_pid = getpid(); /* so that we know which is the main thread */
|
|
if (usconfig(CONF_ARENATYPE, US_SHAREDONLY) < 0)
|
|
perror("usconfig - CONF_ARENATYPE");
|
|
usconfig(CONF_LOCKTYPE, US_DEBUG); /* XXX */
|
|
#ifdef Py_DEBUG
|
|
if (thread_debug & 4)
|
|
usconfig(CONF_LOCKTYPE, US_DEBUGPLUS);
|
|
else if (thread_debug & 2)
|
|
usconfig(CONF_LOCKTYPE, US_DEBUG);
|
|
#endif /* Py_DEBUG */
|
|
if ((shared_arena = usinit(tmpnam(0))) == 0)
|
|
perror("usinit");
|
|
#ifdef USE_DL
|
|
if (usconfig(CONF_ATTACHADDR, addr) < 0) /* reset address */
|
|
perror("usconfig - CONF_ATTACHADDR (reset)");
|
|
#endif /* USE_DL */
|
|
if ((count_lock = usnewlock(shared_arena)) == NULL)
|
|
perror("usnewlock (count_lock)");
|
|
(void) usinitlock(count_lock);
|
|
if ((wait_lock = usnewlock(shared_arena)) == NULL)
|
|
perror("usnewlock (wait_lock)");
|
|
dprintf(("arena start: %p, arena size: %ld\n", shared_arena, (long) usconfig(CONF_GETSIZE, shared_arena)));
|
|
}
|
|
|
|
/*
|
|
* Thread support.
|
|
*/
|
|
|
|
static void clean_threads(void)
|
|
{
|
|
int i, j;
|
|
pid_t mypid, pid;
|
|
|
|
/* clean up any exited threads */
|
|
mypid = getpid();
|
|
i = 0;
|
|
while (i < maxpidindex) {
|
|
if (pidlist[i].parent == mypid && (pid = pidlist[i].child) > 0) {
|
|
pid = waitpid(pid, 0, WNOHANG);
|
|
if (pid > 0) {
|
|
/* a thread has exited */
|
|
pidlist[i] = pidlist[--maxpidindex];
|
|
/* remove references to children of dead proc */
|
|
for (j = 0; j < maxpidindex; j++)
|
|
if (pidlist[j].parent == pid)
|
|
pidlist[j].child = -1;
|
|
continue; /* don't increment i */
|
|
}
|
|
}
|
|
i++;
|
|
}
|
|
/* clean up the list */
|
|
i = 0;
|
|
while (i < maxpidindex) {
|
|
if (pidlist[i].child == -1) {
|
|
pidlist[i] = pidlist[--maxpidindex];
|
|
continue; /* don't increment i */
|
|
}
|
|
i++;
|
|
}
|
|
}
|
|
|
|
long PyThread_start_new_thread(void (*func)(void *), void *arg)
|
|
{
|
|
#ifdef USE_DL
|
|
long addr, size;
|
|
static int local_initialized = 0;
|
|
#endif /* USE_DL */
|
|
int success = 0; /* init not needed when SOLARIS_THREADS and */
|
|
/* C_THREADS implemented properly */
|
|
|
|
dprintf(("PyThread_start_new_thread called\n"));
|
|
if (!initialized)
|
|
PyThread_init_thread();
|
|
switch (ussetlock(count_lock)) {
|
|
case 0: return 0;
|
|
case -1: perror("ussetlock (count_lock)");
|
|
}
|
|
if (maxpidindex >= MAXPROC)
|
|
success = -1;
|
|
else {
|
|
#ifdef USE_DL
|
|
if (!local_initialized) {
|
|
if ((size = usconfig(CONF_INITSIZE, 64*1024)) < 0)
|
|
perror("usconfig - CONF_INITSIZE (check)");
|
|
if (usconfig(CONF_INITSIZE, size) < 0)
|
|
perror("usconfig - CONF_INITSIZE (reset)");
|
|
addr = (long) dl_getrange(size + HDR_SIZE);
|
|
dprintf(("trying to use addr %p-%p for sproc\n",
|
|
addr, addr+size));
|
|
errno = 0;
|
|
if ((addr = usconfig(CONF_ATTACHADDR, addr)) < 0 &&
|
|
errno != 0)
|
|
perror("usconfig - CONF_ATTACHADDR (set)");
|
|
}
|
|
#endif /* USE_DL */
|
|
clean_threads();
|
|
if ((success = sproc(func, PR_SALL, arg)) < 0)
|
|
perror("sproc");
|
|
#ifdef USE_DL
|
|
if (!local_initialized) {
|
|
if (usconfig(CONF_ATTACHADDR, addr) < 0)
|
|
/* reset address */
|
|
perror("usconfig - CONF_ATTACHADDR (reset)");
|
|
local_initialized = 1;
|
|
}
|
|
#endif /* USE_DL */
|
|
if (success >= 0) {
|
|
nthreads++;
|
|
pidlist[maxpidindex].parent = getpid();
|
|
pidlist[maxpidindex++].child = success;
|
|
dprintf(("pidlist[%d] = %d\n",
|
|
maxpidindex-1, success));
|
|
}
|
|
}
|
|
if (usunsetlock(count_lock) < 0)
|
|
perror("usunsetlock (count_lock)");
|
|
return success;
|
|
}
|
|
|
|
long PyThread_get_thread_ident(void)
|
|
{
|
|
return getpid();
|
|
}
|
|
|
|
void PyThread_exit_thread(void)
|
|
{
|
|
dprintf(("PyThread_exit_thread called\n"));
|
|
if (!initialized)
|
|
exit(0);
|
|
if (ussetlock(count_lock) < 0)
|
|
perror("ussetlock (count_lock)");
|
|
nthreads--;
|
|
if (getpid() == my_pid) {
|
|
/* main thread; wait for other threads to exit */
|
|
exiting = 1;
|
|
waiting_for_threads = 1;
|
|
if (ussetlock(wait_lock) < 0)
|
|
perror("ussetlock (wait_lock)");
|
|
for (;;) {
|
|
if (nthreads < 0) {
|
|
dprintf(("really exit (%d)\n", exit_status));
|
|
exit(exit_status);
|
|
}
|
|
if (usunsetlock(count_lock) < 0)
|
|
perror("usunsetlock (count_lock)");
|
|
dprintf(("waiting for other threads (%d)\n", nthreads));
|
|
if (ussetlock(wait_lock) < 0)
|
|
perror("ussetlock (wait_lock)");
|
|
if (ussetlock(count_lock) < 0)
|
|
perror("ussetlock (count_lock)");
|
|
}
|
|
}
|
|
/* not the main thread */
|
|
if (waiting_for_threads) {
|
|
dprintf(("main thread is waiting\n"));
|
|
if (usunsetlock(wait_lock) < 0)
|
|
perror("usunsetlock (wait_lock)");
|
|
}
|
|
if (usunsetlock(count_lock) < 0)
|
|
perror("usunsetlock (count_lock)");
|
|
_exit(0);
|
|
}
|
|
|
|
/*
|
|
* Lock support.
|
|
*/
|
|
PyThread_type_lock PyThread_allocate_lock(void)
|
|
{
|
|
ulock_t lock;
|
|
|
|
dprintf(("PyThread_allocate_lock called\n"));
|
|
if (!initialized)
|
|
PyThread_init_thread();
|
|
|
|
if ((lock = usnewlock(shared_arena)) == NULL)
|
|
perror("usnewlock");
|
|
(void) usinitlock(lock);
|
|
dprintf(("PyThread_allocate_lock() -> %p\n", lock));
|
|
return (PyThread_type_lock) lock;
|
|
}
|
|
|
|
void PyThread_free_lock(PyThread_type_lock lock)
|
|
{
|
|
dprintf(("PyThread_free_lock(%p) called\n", lock));
|
|
usfreelock((ulock_t) lock, shared_arena);
|
|
}
|
|
|
|
int PyThread_acquire_lock(PyThread_type_lock lock, int waitflag)
|
|
{
|
|
int success;
|
|
|
|
dprintf(("PyThread_acquire_lock(%p, %d) called\n", lock, waitflag));
|
|
errno = 0; /* clear it just in case */
|
|
if (waitflag)
|
|
success = ussetlock((ulock_t) lock);
|
|
else
|
|
success = uscsetlock((ulock_t) lock, 1); /* Try it once */
|
|
if (success < 0)
|
|
perror(waitflag ? "ussetlock" : "uscsetlock");
|
|
dprintf(("PyThread_acquire_lock(%p, %d) -> %d\n", lock, waitflag, success));
|
|
return success;
|
|
}
|
|
|
|
void PyThread_release_lock(PyThread_type_lock lock)
|
|
{
|
|
dprintf(("PyThread_release_lock(%p) called\n", lock));
|
|
if (usunsetlock((ulock_t) lock) < 0)
|
|
perror("usunsetlock");
|
|
}
|