libgc/solaris_pthreads.c

   1 /*
   2  * Copyright (c) 1994 by Xerox Corporation.  All rights reserved.
   3  *
   4  * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
   5  * OR IMPLIED.  ANY USE IS AT YOUR OWN RISK.
   6  *
   7  * Permission is hereby granted to use or copy this program
   8  * for any purpose,  provided the above notices are retained on all copies.
   9  * Permission to modify the code and to distribute modified code is granted,
  10  * provided the above notices are retained, and a notice that the code was
  11  * modified is included with the above copyright notice.
  12  */
  13 /*
  14  * Support code for Solaris threads.  Provides functionality we wish Sun
  15  * had provided.  Relies on some information we probably shouldn't rely on.
  16  * Modified by Peter C. for Solaris Posix Threads.
  17  */
  18
  19 # include "private/gc_priv.h"
  20
  21 # if defined(GC_SOLARIS_PTHREADS)
  22 # include <pthread.h>
  23 # include <thread.h>
  24 # include <signal.h>
  25 # include <fcntl.h>
  26 # include <sys/types.h>
  27 # include <sys/mman.h>
  28 # include <sys/time.h>
  29 # include <sys/resource.h>
  30 # include <sys/stat.h>
  31 # include <sys/syscall.h>
  32 # include <sys/procfs.h>
  33 # include <sys/lwp.h>
  34 # include <sys/reg.h>
  35 # define _CLASSIC_XOPEN_TYPES
  36 # include <unistd.h>
  37 # include <errno.h>
  38 # include "private/solaris_threads.h"
  39 # include <stdio.h>
  40
  41 #undef pthread_join
  42 #undef pthread_create
  43
  44 pthread_cond_t GC_prom_join_cv;         /* Broadcast when any thread terminates */
  45 pthread_cond_t GC_create_cv;            /* Signalled when a new undetached      */
  46                                 /* thread starts.                       */
  47
  48 extern GC_bool GC_multithreaded;
  49
  50 /* We use the allocation lock to protect thread-related data structures. */
  51
  52 /* We stop the world using /proc primitives.  This makes some   */
  53 /* minimal assumptions about the threads implementation.        */
  54 /* We don't play by the rules, since the rules make this        */
  55 /* impossible (as of Solaris 2.3).  Also note that as of        */
  56 /* Solaris 2.3 the various thread and lwp suspension            */
  57 /* primitives failed to stop threads by the time the request    */
  58 /* is completed.                                                */
  59
  60
  61
  62 int GC_pthread_join(pthread_t wait_for, void **status)
  63 {
  64         return GC_thr_join((thread_t)wait_for, NULL, status);
  65 }
  66
  67 int GC_pthread_detach(pthread_t thread)
  68 {
  69         GC_thread t;
  70
  71         LOCK();
  72         t=GC_lookup_thread(thread);
  73         UNLOCK();
  74         if (t) {
  75                 LOCK();
  76                 t->flags |= DETACHED;
  77                 UNLOCK();
  78                 return 0;
  79         }
  80         else
  81                 return pthread_detach(thread);
  82 }
  83
  84 int
  85 GC_pthread_create(pthread_t *new_thread,
  86           const pthread_attr_t *attr_in,
  87           void * (*thread_execp)(void *), void *arg)
  88 {
  89     int result;
  90     GC_thread t;
  91     pthread_t my_new_thread;
  92     pthread_attr_t  attr;
  93     word my_flags = 0;
  94     int  flag;
  95     void * stack = 0;
  96     size_t stack_size = 0;
  97     int    n;
  98     struct sched_param schedparam;
  99
 100     (void)pthread_attr_init(&attr);
 101     if (attr_in != 0) {
 102         (void)pthread_attr_getstacksize(attr_in, &stack_size);
 103         (void)pthread_attr_getstackaddr(attr_in, &stack);
 104     }
 105
 106     LOCK();
 107     if (!GC_is_initialized) {
 108             GC_init_inner();
 109     }
 110     GC_multithreaded++;
 111
 112     if (stack == 0) {
 113         if (stack_size == 0)
 114                 stack_size = 1048576;
 115                           /* ^-- 1 MB (this was GC_min_stack_sz, but that
 116                            * violates the pthread_create documentation which
 117                            * says the default value if none is supplied is
 118                            * 1MB) */
 119         else
 120                 stack_size += thr_min_stack();
 121
 122         stack = (void *)GC_stack_alloc(&stack_size);
 123         if (stack == 0) {
 124             GC_multithreaded--;
 125             UNLOCK();
 126             errno = ENOMEM;
 127             return -1;
 128         }
 129     } else {
 130         my_flags |= CLIENT_OWNS_STACK;
 131     }
 132     (void)pthread_attr_setstacksize(&attr, stack_size);
 133     (void)pthread_attr_setstackaddr(&attr, stack);
 134     if (attr_in != 0) {
 135         (void)pthread_attr_getscope(attr_in, &n);
 136         (void)pthread_attr_setscope(&attr, n);
 137         (void)pthread_attr_getschedparam(attr_in, &schedparam);
 138         (void)pthread_attr_setschedparam(&attr, &schedparam);
 139         (void)pthread_attr_getschedpolicy(attr_in, &n);
 140         (void)pthread_attr_setschedpolicy(&attr, n);
 141         (void)pthread_attr_getinheritsched(attr_in, &n);
 142         (void)pthread_attr_setinheritsched(&attr, n);
 143
 144         (void)pthread_attr_getdetachstate(attr_in, &flag);
 145         if (flag == PTHREAD_CREATE_DETACHED) {
 146                 my_flags |= DETACHED;
 147         }
 148         (void)pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_JOINABLE);
 149     }
 150     /*
 151      * thr_create can call malloc(), which if redirected will
 152      * attempt to acquire the allocation lock.
 153      * Unlock here to prevent deadlock.
 154      */
 155
 156
 157 #if 0
 158 #ifdef I386
 159     UNLOCK();
 160 #endif
 161 #endif
 162     result =
 163             pthread_create(&my_new_thread, &attr, thread_execp, arg);
 164 #if 0
 165 #ifdef I386
 166     LOCK();
 167 #endif
 168 #endif
 169     if (result == 0) {
 170         t = GC_new_thread(my_new_thread);
 171         t -> flags = my_flags;
 172         if (!(my_flags & DETACHED)) cond_init(&(t->join_cv), USYNC_THREAD, 0);
 173         t -> stack = stack;
 174         t -> stack_size = stack_size;
 175         if (new_thread != 0) *new_thread = my_new_thread;
 176         pthread_cond_signal(&GC_create_cv);
 177     } else {
 178             if (!(my_flags & CLIENT_OWNS_STACK)) {
 179                     GC_stack_free(stack, stack_size);
 180             }
 181             GC_multithreaded--;
 182     }
 183     UNLOCK();
 184     pthread_attr_destroy(&attr);
 185     return(result);
 186 }
 187
 188 # else
 189
 190 #ifndef LINT
 191   int GC_no_sunOS_pthreads;
 192 #endif
 193
 194 # endif /* GC_SOLARIS_PTHREADS */
 195