| 1 |
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| 2 | #include <stdlib.h>
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| 3 | #include <stdio.h>
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| 4 | #include <signal.h>
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| 5 | #include <sys/types.h>
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| 6 | #include <sys/wait.h>
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| 7 | #include <sys/prctl.h>
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| 8 | #include <ulocks.h>
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| 9 | #include <errno.h>
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| 10 |
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| 11 | #define HDR_SIZE 2680 /* sizeof(ushdr_t) */
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| 12 | #define MAXPROC 100 /* max # of threads that can be started */
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| 13 |
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| 14 | static usptr_t *shared_arena;
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| 15 | static ulock_t count_lock; /* protection for some variables */
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| 16 | static ulock_t wait_lock; /* lock used to wait for other threads */
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| 17 | static int waiting_for_threads; /* protected by count_lock */
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| 18 | static int nthreads; /* protected by count_lock */
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| 19 | static int exit_status;
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| 20 | #ifndef NO_EXIT_PROG
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| 21 | static int do_exit; /* indicates that the program is to exit */
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| 22 | #endif
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| 23 | static int exiting; /* we're already exiting (for maybe_exit) */
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| 24 | static pid_t my_pid; /* PID of main thread */
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| 25 | static struct pidlist {
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| 26 | pid_t parent;
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| 27 | pid_t child;
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| 28 | } pidlist[MAXPROC]; /* PIDs of other threads; protected by count_lock */
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| 29 | static int maxpidindex; /* # of PIDs in pidlist */
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| 30 |
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| 31 | #ifndef NO_EXIT_PROG
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| 32 | /*
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| 33 | * This routine is called as a signal handler when another thread
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| 34 | * exits. When that happens, we must see whether we have to exit as
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| 35 | * well (because of an PyThread_exit_prog()) or whether we should continue on.
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| 36 | */
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| 37 | static void exit_sig(void)
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| 38 | {
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| 39 | d2printf(("exit_sig called\n"));
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| 40 | if (exiting && getpid() == my_pid) {
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| 41 | d2printf(("already exiting\n"));
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| 42 | return;
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| 43 | }
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| 44 | if (do_exit) {
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| 45 | d2printf(("exiting in exit_sig\n"));
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| 46 | #ifdef Py_DEBUG
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| 47 | if ((thread_debug & 8) == 0)
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| 48 | thread_debug &= ~1; /* don't produce debug messages */
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| 49 | #endif
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| 50 | PyThread_exit_thread();
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| 51 | }
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| 52 | }
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| 53 |
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| 54 | /*
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| 55 | * This routine is called when a process calls exit(). If that wasn't
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| 56 | * done from the library, we do as if an PyThread_exit_prog() was intended.
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| 57 | */
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| 58 | static void maybe_exit(void)
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| 59 | {
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| 60 | dprintf(("maybe_exit called\n"));
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| 61 | if (exiting) {
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| 62 | dprintf(("already exiting\n"));
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| 63 | return;
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| 64 | }
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| 65 | PyThread_exit_prog(0);
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| 66 | }
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| 67 | #endif /* NO_EXIT_PROG */
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| 68 |
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| 69 | /*
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| 70 | * Initialization.
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| 71 | */
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| 72 | static void PyThread__init_thread(void)
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| 73 | {
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| 74 | #ifndef NO_EXIT_PROG
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| 75 | struct sigaction s;
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| 76 | #endif /* NO_EXIT_PROG */
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| 77 | #ifdef USE_DL
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| 78 | long addr, size;
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| 79 | #endif /* USE_DL */
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| 80 |
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| 81 |
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| 82 | #ifdef USE_DL
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| 83 | if ((size = usconfig(CONF_INITSIZE, 64*1024)) < 0)
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| 84 | perror("usconfig - CONF_INITSIZE (check)");
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| 85 | if (usconfig(CONF_INITSIZE, size) < 0)
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| 86 | perror("usconfig - CONF_INITSIZE (reset)");
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| 87 | addr = (long) dl_getrange(size + HDR_SIZE);
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| 88 | dprintf(("trying to use addr %p-%p for shared arena\n", addr, addr+size));
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| 89 | errno = 0;
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| 90 | if ((addr = usconfig(CONF_ATTACHADDR, addr)) < 0 && errno != 0)
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| 91 | perror("usconfig - CONF_ATTACHADDR (set)");
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| 92 | #endif /* USE_DL */
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| 93 | if (usconfig(CONF_INITUSERS, 16) < 0)
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| 94 | perror("usconfig - CONF_INITUSERS");
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| 95 | my_pid = getpid(); /* so that we know which is the main thread */
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| 96 | #ifndef NO_EXIT_PROG
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| 97 | atexit(maybe_exit);
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| 98 | s.sa_handler = exit_sig;
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| 99 | sigemptyset(&s.sa_mask);
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| 100 | /*sigaddset(&s.sa_mask, SIGUSR1);*/
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| 101 | s.sa_flags = 0;
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| 102 | sigaction(SIGUSR1, &s, 0);
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| 103 | if (prctl(PR_SETEXITSIG, SIGUSR1) < 0)
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| 104 | perror("prctl - PR_SETEXITSIG");
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| 105 | #endif /* NO_EXIT_PROG */
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| 106 | if (usconfig(CONF_ARENATYPE, US_SHAREDONLY) < 0)
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| 107 | perror("usconfig - CONF_ARENATYPE");
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| 108 | usconfig(CONF_LOCKTYPE, US_DEBUG); /* XXX */
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| 109 | #ifdef Py_DEBUG
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| 110 | if (thread_debug & 4)
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| 111 | usconfig(CONF_LOCKTYPE, US_DEBUGPLUS);
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| 112 | else if (thread_debug & 2)
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| 113 | usconfig(CONF_LOCKTYPE, US_DEBUG);
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| 114 | #endif /* Py_DEBUG */
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| 115 | if ((shared_arena = usinit(tmpnam(0))) == 0)
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| 116 | perror("usinit");
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| 117 | #ifdef USE_DL
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| 118 | if (usconfig(CONF_ATTACHADDR, addr) < 0) /* reset address */
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| 119 | perror("usconfig - CONF_ATTACHADDR (reset)");
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| 120 | #endif /* USE_DL */
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| 121 | if ((count_lock = usnewlock(shared_arena)) == NULL)
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| 122 | perror("usnewlock (count_lock)");
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| 123 | (void) usinitlock(count_lock);
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| 124 | if ((wait_lock = usnewlock(shared_arena)) == NULL)
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| 125 | perror("usnewlock (wait_lock)");
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| 126 | dprintf(("arena start: %p, arena size: %ld\n", shared_arena, (long) usconfig(CONF_GETSIZE, shared_arena)));
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| 127 | }
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| 128 |
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| 129 | /*
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| 130 | * Thread support.
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| 131 | */
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| 132 |
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| 133 | static void clean_threads(void)
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| 134 | {
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| 135 | int i, j;
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| 136 | pid_t mypid, pid;
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| 137 |
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| 138 | /* clean up any exited threads */
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| 139 | mypid = getpid();
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| 140 | i = 0;
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| 141 | while (i < maxpidindex) {
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| 142 | if (pidlist[i].parent == mypid && (pid = pidlist[i].child) > 0) {
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| 143 | pid = waitpid(pid, 0, WNOHANG);
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| 144 | if (pid > 0) {
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| 145 | /* a thread has exited */
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| 146 | pidlist[i] = pidlist[--maxpidindex];
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| 147 | /* remove references to children of dead proc */
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| 148 | for (j = 0; j < maxpidindex; j++)
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| 149 | if (pidlist[j].parent == pid)
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| 150 | pidlist[j].child = -1;
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| 151 | continue; /* don't increment i */
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| 152 | }
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| 153 | }
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| 154 | i++;
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| 155 | }
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| 156 | /* clean up the list */
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| 157 | i = 0;
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| 158 | while (i < maxpidindex) {
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| 159 | if (pidlist[i].child == -1) {
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| 160 | pidlist[i] = pidlist[--maxpidindex];
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| 161 | continue; /* don't increment i */
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| 162 | }
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| 163 | i++;
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| 164 | }
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| 165 | }
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| 166 |
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| 167 | long PyThread_start_new_thread(void (*func)(void *), void *arg)
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| 168 | {
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| 169 | #ifdef USE_DL
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| 170 | long addr, size;
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| 171 | static int local_initialized = 0;
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| 172 | #endif /* USE_DL */
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| 173 | int success = 0; /* init not needed when SOLARIS_THREADS and */
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| 174 | /* C_THREADS implemented properly */
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| 175 |
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| 176 | dprintf(("PyThread_start_new_thread called\n"));
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| 177 | if (!initialized)
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| 178 | PyThread_init_thread();
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| 179 | switch (ussetlock(count_lock)) {
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| 180 | case 0: return 0;
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| 181 | case -1: perror("ussetlock (count_lock)");
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| 182 | }
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| 183 | if (maxpidindex >= MAXPROC)
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| 184 | success = -1;
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| 185 | else {
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| 186 | #ifdef USE_DL
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| 187 | if (!local_initialized) {
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| 188 | if ((size = usconfig(CONF_INITSIZE, 64*1024)) < 0)
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| 189 | perror("usconfig - CONF_INITSIZE (check)");
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| 190 | if (usconfig(CONF_INITSIZE, size) < 0)
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| 191 | perror("usconfig - CONF_INITSIZE (reset)");
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| 192 | addr = (long) dl_getrange(size + HDR_SIZE);
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| 193 | dprintf(("trying to use addr %p-%p for sproc\n",
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| 194 | addr, addr+size));
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| 195 | errno = 0;
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| 196 | if ((addr = usconfig(CONF_ATTACHADDR, addr)) < 0 &&
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| 197 | errno != 0)
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| 198 | perror("usconfig - CONF_ATTACHADDR (set)");
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| 199 | }
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| 200 | #endif /* USE_DL */
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| 201 | clean_threads();
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| 202 | if ((success = sproc(func, PR_SALL, arg)) < 0)
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| 203 | perror("sproc");
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| 204 | #ifdef USE_DL
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| 205 | if (!local_initialized) {
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| 206 | if (usconfig(CONF_ATTACHADDR, addr) < 0)
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| 207 | /* reset address */
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| 208 | perror("usconfig - CONF_ATTACHADDR (reset)");
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| 209 | local_initialized = 1;
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| 210 | }
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| 211 | #endif /* USE_DL */
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| 212 | if (success >= 0) {
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| 213 | nthreads++;
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| 214 | pidlist[maxpidindex].parent = getpid();
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| 215 | pidlist[maxpidindex++].child = success;
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| 216 | dprintf(("pidlist[%d] = %d\n",
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| 217 | maxpidindex-1, success));
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| 218 | }
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| 219 | }
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| 220 | if (usunsetlock(count_lock) < 0)
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| 221 | perror("usunsetlock (count_lock)");
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| 222 | return success;
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| 223 | }
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| 224 |
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| 225 | long PyThread_get_thread_ident(void)
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| 226 | {
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| 227 | return getpid();
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| 228 | }
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| 229 |
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| 230 | static void do_PyThread_exit_thread(int no_cleanup)
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| 231 | {
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| 232 | dprintf(("PyThread_exit_thread called\n"));
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| 233 | if (!initialized)
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| 234 | if (no_cleanup)
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| 235 | _exit(0);
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| 236 | else
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| 237 | exit(0);
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| 238 | if (ussetlock(count_lock) < 0)
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| 239 | perror("ussetlock (count_lock)");
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| 240 | nthreads--;
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| 241 | if (getpid() == my_pid) {
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| 242 | /* main thread; wait for other threads to exit */
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| 243 | exiting = 1;
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| 244 | #ifndef NO_EXIT_PROG
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| 245 | if (do_exit) {
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| 246 | int i;
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| 247 |
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| 248 | /* notify other threads */
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| 249 | clean_threads();
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| 250 | if (nthreads >= 0) {
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| 251 | dprintf(("kill other threads\n"));
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| 252 | for (i = 0; i < maxpidindex; i++)
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| 253 | if (pidlist[i].child > 0)
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| 254 | (void) kill(pidlist[i].child,
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| 255 | SIGKILL);
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| 256 | _exit(exit_status);
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| 257 | }
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| 258 | }
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| 259 | #endif /* NO_EXIT_PROG */
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| 260 | waiting_for_threads = 1;
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| 261 | if (ussetlock(wait_lock) < 0)
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| 262 | perror("ussetlock (wait_lock)");
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| 263 | for (;;) {
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| 264 | if (nthreads < 0) {
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| 265 | dprintf(("really exit (%d)\n", exit_status));
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| 266 | if (no_cleanup)
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| 267 | _exit(exit_status);
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| 268 | else
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| 269 | exit(exit_status);
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| 270 | }
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| 271 | if (usunsetlock(count_lock) < 0)
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| 272 | perror("usunsetlock (count_lock)");
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| 273 | dprintf(("waiting for other threads (%d)\n", nthreads));
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| 274 | if (ussetlock(wait_lock) < 0)
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| 275 | perror("ussetlock (wait_lock)");
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| 276 | if (ussetlock(count_lock) < 0)
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| 277 | perror("ussetlock (count_lock)");
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| 278 | }
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| 279 | }
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| 280 | /* not the main thread */
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| 281 | if (waiting_for_threads) {
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| 282 | dprintf(("main thread is waiting\n"));
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| 283 | if (usunsetlock(wait_lock) < 0)
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| 284 | perror("usunsetlock (wait_lock)");
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| 285 | }
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| 286 | #ifndef NO_EXIT_PROG
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| 287 | else if (do_exit)
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| 288 | (void) kill(my_pid, SIGUSR1);
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| 289 | #endif /* NO_EXIT_PROG */
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| 290 | if (usunsetlock(count_lock) < 0)
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| 291 | perror("usunsetlock (count_lock)");
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| 292 | _exit(0);
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| 293 | }
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| 294 |
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| 295 | void PyThread_exit_thread(void)
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| 296 | {
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| 297 | do_PyThread_exit_thread(0);
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| 298 | }
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| 299 |
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| 300 | void PyThread__exit_thread(void)
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| 301 | {
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| 302 | do_PyThread_exit_thread(1);
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| 303 | }
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| 304 |
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| 305 | #ifndef NO_EXIT_PROG
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| 306 | static void do_PyThread_exit_prog(int status, int no_cleanup)
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| 307 | {
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| 308 | dprintf(("PyThread_exit_prog(%d) called\n", status));
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| 309 | if (!initialized)
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| 310 | if (no_cleanup)
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| 311 | _exit(status);
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| 312 | else
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| 313 | exit(status);
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| 314 | do_exit = 1;
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| 315 | exit_status = status;
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| 316 | do_PyThread_exit_thread(no_cleanup);
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| 317 | }
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| 318 |
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| 319 | void PyThread_exit_prog(int status)
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| 320 | {
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| 321 | do_PyThread_exit_prog(status, 0);
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| 322 | }
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| 323 |
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| 324 | void PyThread__exit_prog(int status)
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| 325 | {
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| 326 | do_PyThread_exit_prog(status, 1);
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| 327 | }
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| 328 | #endif /* NO_EXIT_PROG */
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| 329 |
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| 330 | /*
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| 331 | * Lock support.
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| 332 | */
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| 333 | PyThread_type_lock PyThread_allocate_lock(void)
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| 334 | {
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| 335 | ulock_t lock;
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| 336 |
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| 337 | dprintf(("PyThread_allocate_lock called\n"));
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| 338 | if (!initialized)
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| 339 | PyThread_init_thread();
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| 340 |
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| 341 | if ((lock = usnewlock(shared_arena)) == NULL)
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| 342 | perror("usnewlock");
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| 343 | (void) usinitlock(lock);
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| 344 | dprintf(("PyThread_allocate_lock() -> %p\n", lock));
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| 345 | return (PyThread_type_lock) lock;
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| 346 | }
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| 347 |
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| 348 | void PyThread_free_lock(PyThread_type_lock lock)
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| 349 | {
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| 350 | dprintf(("PyThread_free_lock(%p) called\n", lock));
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| 351 | usfreelock((ulock_t) lock, shared_arena);
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| 352 | }
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| 353 |
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| 354 | int PyThread_acquire_lock(PyThread_type_lock lock, int waitflag)
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| 355 | {
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| 356 | int success;
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| 357 |
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| 358 | dprintf(("PyThread_acquire_lock(%p, %d) called\n", lock, waitflag));
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| 359 | errno = 0; /* clear it just in case */
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| 360 | if (waitflag)
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| 361 | success = ussetlock((ulock_t) lock);
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| 362 | else
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| 363 | success = uscsetlock((ulock_t) lock, 1); /* Try it once */
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| 364 | if (success < 0)
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| 365 | perror(waitflag ? "ussetlock" : "uscsetlock");
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| 366 | dprintf(("PyThread_acquire_lock(%p, %d) -> %d\n", lock, waitflag, success));
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| 367 | return success;
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| 368 | }
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| 369 |
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| 370 | void PyThread_release_lock(PyThread_type_lock lock)
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| 371 | {
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| 372 | dprintf(("PyThread_release_lock(%p) called\n", lock));
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| 373 | if (usunsetlock((ulock_t) lock) < 0)
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| 374 | perror("usunsetlock");
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| 375 | }
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