boehm-gc/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 Peter C. for Solaris Posix Threads.
  17  */
  18 /* Boehm, September 14, 1994 4:44 pm PDT */
  19
  20 # if defined(_SOLARIS_PTHREADS)
  21 # include "gc_priv.h"
  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 "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
  68 int
  69 GC_pthread_create(pthread_t *new_thread,
  70           const pthread_attr_t *attr_in,
  71           void * (*thread_execp)(void *), void *arg)
  72 {
  73     int result;
  74     GC_thread t;
  75     pthread_t my_new_thread;
  76     pthread_attr_t  attr;
  77     word my_flags = 0;
  78     int  flag;
  79     void * stack;
  80     size_t stack_size;
  81     int    n;
  82     struct sched_param schedparam;
  83
  84     (void)pthread_attr_getstacksize(attr_in, &stack_size);
  85     (void)pthread_attr_getstackaddr(attr_in, &stack);
  86     (void)pthread_attr_init(&attr);
  87
  88     LOCK();
  89     if (!GC_thr_initialized) {
  90             GC_thr_init();
  91     }
  92     GC_multithreaded++;
  93
  94     if (stack == 0) {
  95         if (stack_size == 0)
  96                 stack_size = GC_min_stack_sz;
  97         else
  98                 stack_size += thr_min_stack();
  99
 100         stack = (void *)GC_stack_alloc(&stack_size);
 101         if (stack == 0) {
 102             GC_multithreaded--;
 103             UNLOCK();
 104             errno = ENOMEM;
 105             return -1;
 106         }
 107     } else {
 108         my_flags |= CLIENT_OWNS_STACK;
 109     }
 110     (void)pthread_attr_setstacksize(&attr, stack_size);
 111     (void)pthread_attr_setstackaddr(&attr, stack);
 112     (void)pthread_attr_getscope(attr_in, &n);
 113     (void)pthread_attr_setscope(&attr, n);
 114     (void)pthread_attr_getschedparam(attr_in, &schedparam);
 115     (void)pthread_attr_setschedparam(&attr, &schedparam);
 116     (void)pthread_attr_getschedpolicy(attr_in, &n);
 117     (void)pthread_attr_setschedpolicy(&attr, n);
 118     (void)pthread_attr_getinheritsched(attr_in, &n);
 119     (void)pthread_attr_setinheritsched(&attr, n);
 120
 121     (void)pthread_attr_getdetachstate(attr_in, &flag);
 122     if (flag == PTHREAD_CREATE_DETACHED) {
 123             my_flags |= DETACHED;
 124     }
 125     (void)pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_JOINABLE);
 126     /*
 127      * thr_create can call malloc(), which if redirected will
 128      * attempt to acquire the allocation lock.
 129      * Unlock here to prevent deadlock.
 130      */
 131
 132
 133 #if 0
 134 #ifdef I386
 135     UNLOCK();
 136 #endif
 137 #endif
 138     result =
 139             pthread_create(&my_new_thread, &attr, thread_execp, arg);
 140 #if 0
 141 #ifdef I386
 142     LOCK();
 143 #endif
 144 #endif
 145     if (result == 0) {
 146         t = GC_new_thread(my_new_thread);
 147         t -> flags = my_flags;
 148         if (!(my_flags & DETACHED)) cond_init(&(t->join_cv), USYNC_THREAD, 0);
 149         t -> stack = stack;
 150         t -> stack_size = stack_size;
 151         if (new_thread != 0) *new_thread = my_new_thread;
 152         pthread_cond_signal(&GC_create_cv);
 153     } else {
 154             if (!(my_flags & CLIENT_OWNS_STACK)) {
 155                     GC_stack_free(stack, stack_size);
 156             }
 157             GC_multithreaded--;
 158     }
 159     UNLOCK();
 160     pthread_attr_destroy(&attr);
 161     return(result);
 162 }
 163
 164 # else
 165
 166 #ifndef LINT
 167   int GC_no_sunOS_pthreads;
 168 #endif
 169
 170 # endif /* SOLARIS_THREADS */
 171