remove gc

1 files changed, 0 insertions, 956 deletions

diff --git a/gc/solaris_threads.c b/gc/solaris_threads.c
deleted file mode 100644
index 5f05b19..0000000
--- a/gc/solaris_threads.c
+++ /dev/null
@@ -1,956 +0,0 @@
-/* 
- * Copyright (c) 1994 by Xerox Corporation.  All rights reserved.
- *
- * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
- * OR IMPLIED.  ANY USE IS AT YOUR OWN RISK.
- *
- * Permission is hereby granted to use or copy this program
- * for any purpose,  provided the above notices are retained on all copies.
- * Permission to modify the code and to distribute modified code is granted,
- * provided the above notices are retained, and a notice that the code was
- * modified is included with the above copyright notice.
- */
-/*
- * Support code for Solaris threads.  Provides functionality we wish Sun
- * had provided.  Relies on some information we probably shouldn't rely on.
- */
-/* Boehm, September 14, 1994 4:44 pm PDT */
-
-# if defined(GC_SOLARIS_THREADS) || defined(GC_SOLARIS_PTHREADS)
-
-# include "private/gc_priv.h"
-# include "private/solaris_threads.h"
-# include <thread.h>
-# include <synch.h>
-# include <signal.h>
-# include <fcntl.h>
-# include <sys/types.h>
-# include <sys/mman.h>
-# include <sys/time.h>
-# include <sys/resource.h>
-# include <sys/stat.h>
-# include <sys/syscall.h>
-# include <sys/procfs.h>
-# include <sys/lwp.h>
-# include <sys/reg.h>
-# define _CLASSIC_XOPEN_TYPES
-# include <unistd.h>
-# include <errno.h>
-
-#ifdef HANDLE_FORK
-  --> Not yet supported.  Try porting the code from linux_threads.c.
-#endif
-
-/*
- * This is the default size of the LWP arrays. If there are more LWPs
- * than this when a stop-the-world GC happens, set_max_lwps will be
- * called to cope.
- * This must be higher than the number of LWPs at startup time.
- * The threads library creates a thread early on, so the min. is 3
- */
-# define DEFAULT_MAX_LWPS	4
-
-#undef thr_join
-#undef thr_create
-#undef thr_suspend
-#undef thr_continue
-
-cond_t GC_prom_join_cv;		/* Broadcast when any thread terminates	*/
-cond_t GC_create_cv;		/* Signalled when a new undetached	*/
-				/* thread starts.			*/
-				
-
-#ifdef MMAP_STACKS
-static int GC_zfd;
-#endif /* MMAP_STACKS */
-
-/* We use the allocation lock to protect thread-related data structures. */
-
-/* We stop the world using /proc primitives.  This makes some	*/
-/* minimal assumptions about the threads implementation.	*/
-/* We don't play by the rules, since the rules make this	*/
-/* impossible (as of Solaris 2.3).  Also note that as of	*/
-/* Solaris 2.3 the various thread and lwp suspension		*/
-/* primitives failed to stop threads by the time the request	*/
-/* is completed.						*/
-
-
-static sigset_t old_mask;
-
-/* Sleep for n milliseconds, n < 1000	*/
-void GC_msec_sleep(int n)
-{
-    struct timespec ts;
-                            
-    ts.tv_sec = 0;
-    ts.tv_nsec = 1000000*n;
-    if (syscall(SYS_nanosleep, &ts, 0) < 0) {
-	ABORT("nanosleep failed");
-    }
-}
-/* Turn off preemption;  gross but effective.  		*/
-/* Caller has allocation lock.				*/
-/* Actually this is not needed under Solaris 2.3 and	*/
-/* 2.4, but hopefully that'll change.			*/
-void preempt_off()
-{
-    sigset_t set;
-
-    (void)sigfillset(&set);
-    sigdelset(&set, SIGABRT);
-    syscall(SYS_sigprocmask, SIG_SETMASK, &set, &old_mask);
-}
-
-void preempt_on()
-{
-    syscall(SYS_sigprocmask, SIG_SETMASK, &old_mask, NULL);
-}
-
-int GC_main_proc_fd = -1;
-
-
-struct lwp_cache_entry {
-    lwpid_t lc_id;
-    int lc_descr;	/* /proc file descriptor.	*/
-}  GC_lwp_cache_default[DEFAULT_MAX_LWPS];
-
-static int max_lwps = DEFAULT_MAX_LWPS;
-static struct lwp_cache_entry *GC_lwp_cache = GC_lwp_cache_default;
-
-static prgregset_t GC_lwp_registers_default[DEFAULT_MAX_LWPS];
-static prgregset_t *GC_lwp_registers = GC_lwp_registers_default;
-
-/* Return a file descriptor for the /proc entry corresponding	*/
-/* to the given lwp.  The file descriptor may be stale if the	*/
-/* lwp exited and a new one was forked.				*/
-static int open_lwp(lwpid_t id)
-{
-    int result;
-    static int next_victim = 0;
-    register int i;
-    
-    for (i = 0; i < max_lwps; i++) {
-    	if (GC_lwp_cache[i].lc_id == id) return(GC_lwp_cache[i].lc_descr);
-    }
-    result = syscall(SYS_ioctl, GC_main_proc_fd, PIOCOPENLWP, &id);
-    /*
-     * If PIOCOPENLWP fails, try closing fds in the cache until it succeeds.
-     */
-    if (result < 0 && errno == EMFILE) {
-	    for (i = 0; i < max_lwps; i++) {
-		if (GC_lwp_cache[i].lc_id != 0) {
-        		(void)syscall(SYS_close, GC_lwp_cache[i].lc_descr);
-			result = syscall(SYS_ioctl, GC_main_proc_fd, PIOCOPENLWP, &id);
-			if (result >= 0 || (result < 0 && errno != EMFILE))
-				break;
-		}
-	    }
-    }
-    if (result < 0) {
-	if (errno == EMFILE) {
-		ABORT("Too many open files");
-	}
-        return(-1) /* exited? */;
-    }
-    if (GC_lwp_cache[next_victim].lc_id != 0)
-        (void)syscall(SYS_close, GC_lwp_cache[next_victim].lc_descr);
-    GC_lwp_cache[next_victim].lc_id = id;
-    GC_lwp_cache[next_victim].lc_descr = result;
-    if (++next_victim >= max_lwps)
-	next_victim = 0;
-    return(result);
-}
-
-static void uncache_lwp(lwpid_t id)
-{
-    register int i;
-    
-    for (i = 0; i < max_lwps; i++) {
-    	if (GC_lwp_cache[i].lc_id == id) {
-    	    (void)syscall(SYS_close, GC_lwp_cache[id].lc_descr);
-    	    GC_lwp_cache[i].lc_id = 0;
-    	    break;
-    	}
-    }
-}
-	/* Sequence of current lwp ids	*/
-static lwpid_t GC_current_ids_default[DEFAULT_MAX_LWPS + 1];
-static lwpid_t *GC_current_ids = GC_current_ids_default;
-
-	/* Temporary used below (can be big if large number of LWPs) */
-static lwpid_t last_ids_default[DEFAULT_MAX_LWPS + 1];
-static lwpid_t *last_ids = last_ids_default;
-
-
-#define ROUNDUP(n)    WORDS_TO_BYTES(ROUNDED_UP_WORDS(n))
-
-static void set_max_lwps(GC_word n)
-{
-    char *mem;
-    char *oldmem;
-    int required_bytes = ROUNDUP(n * sizeof(struct lwp_cache_entry))
-	+ ROUNDUP(n * sizeof(prgregset_t))
-	+ ROUNDUP((n + 1) * sizeof(lwpid_t))
-	+ ROUNDUP((n + 1) * sizeof(lwpid_t));
-
-    GC_expand_hp_inner(divHBLKSZ((word)required_bytes));
-    oldmem = mem = GC_scratch_alloc(required_bytes);
-    if (0 == mem) ABORT("No space for lwp data structures");
-
-    /*
-     * We can either flush the old lwp cache or copy it over. Do the latter.
-     */
-    memcpy(mem, GC_lwp_cache, max_lwps * sizeof(struct lwp_cache_entry));
-    GC_lwp_cache = (struct lwp_cache_entry*)mem;
-    mem += ROUNDUP(n * sizeof(struct lwp_cache_entry));
-
-    BZERO(GC_lwp_registers, max_lwps * sizeof(GC_lwp_registers[0]));
-    GC_lwp_registers = (prgregset_t *)mem;
-    mem += ROUNDUP(n * sizeof(prgregset_t));
-
-
-    GC_current_ids = (lwpid_t *)mem;
-    mem += ROUNDUP((n + 1) * sizeof(lwpid_t));
-
-    last_ids = (lwpid_t *)mem;
-    mem += ROUNDUP((n + 1)* sizeof(lwpid_t));
-
-    if (mem > oldmem + required_bytes)
-	ABORT("set_max_lwps buffer overflow");
-
-    max_lwps = n;
-}
-
-
-/* Stop all lwps in process.  Assumes preemption is off.	*/
-/* Caller has allocation lock (and any other locks he may	*/
-/* need).							*/
-static void stop_all_lwps()
-{
-    int lwp_fd;
-    char buf[30];
-    prstatus_t status;
-    register int i;
-    GC_bool changed;
-    lwpid_t me = _lwp_self();
-
-    if (GC_main_proc_fd == -1) {
-    	sprintf(buf, "/proc/%d", getpid());
-    	GC_main_proc_fd = syscall(SYS_open, buf, O_RDONLY);
-        if (GC_main_proc_fd < 0) {
-		if (errno == EMFILE)
-			ABORT("/proc open failed: too many open files");
-		GC_printf1("/proc open failed: errno %d", errno);
-		abort();
-        }
-    }
-    BZERO(GC_lwp_registers, sizeof (prgregset_t) * max_lwps);
-    for (i = 0; i < max_lwps; i++)
-	last_ids[i] = 0;
-    for (;;) {
-    if (syscall(SYS_ioctl, GC_main_proc_fd, PIOCSTATUS, &status) < 0)
-    	ABORT("Main PIOCSTATUS failed");
-    	if (status.pr_nlwp < 1)
-    		ABORT("Invalid number of lwps returned by PIOCSTATUS");
-    	if (status.pr_nlwp >= max_lwps) {
-    		set_max_lwps(status.pr_nlwp*2 + 10);
-		/*
-		 * The data in the old GC_current_ids and
-		 * GC_lwp_registers has been trashed. Cleaning out last_ids
-		 * will make sure every LWP gets re-examined.
-		 */
-        	for (i = 0; i < max_lwps; i++)
-			last_ids[i] = 0;
-		continue;
-    }
-        if (syscall(SYS_ioctl, GC_main_proc_fd, PIOCLWPIDS, GC_current_ids) < 0)
-            ABORT("PIOCLWPIDS failed");
-        changed = FALSE;
-        for (i = 0; GC_current_ids[i] != 0 && i < max_lwps; i++) {
-            if (GC_current_ids[i] != last_ids[i]) {
-                changed = TRUE;
-                if (GC_current_ids[i] != me) {
-		    /* PIOCSTOP doesn't work without a writable		*/
-		    /* descriptor.  And that makes the process		*/
-		    /* undebuggable.					*/
-                    if (_lwp_suspend(GC_current_ids[i]) < 0) {
-                        /* Could happen if the lwp exited */
-                        uncache_lwp(GC_current_ids[i]);
-                        GC_current_ids[i] = me; /* ignore */
-                    }
-                }
-            }
-        }
-        /*
-         * In the unlikely event something does a fork between the
-	 * PIOCSTATUS and the PIOCLWPIDS. 
-         */
-        if (i >= max_lwps)
-		continue;
-        /* All lwps in GC_current_ids != me have been suspended.  Note	*/
-        /* that _lwp_suspend is idempotent.				*/
-        for (i = 0; GC_current_ids[i] != 0; i++) {
-            if (GC_current_ids[i] != last_ids[i]) {
-                if (GC_current_ids[i] != me) {
-                    lwp_fd = open_lwp(GC_current_ids[i]);
-		    if (lwp_fd == -1)
-		    {
-			    GC_current_ids[i] = me;
-			    continue;
-		    }
-		    /* LWP should be stopped.  Empirically it sometimes	*/
-		    /* isn't, and more frequently the PR_STOPPED flag	*/
-		    /* is not set.  Wait for PR_STOPPED.		*/
-                    if (syscall(SYS_ioctl, lwp_fd,
-                                PIOCSTATUS, &status) < 0) {
-			/* Possible if the descriptor was stale, or */
-			/* we encountered the 2.3 _lwp_suspend bug. */
-			uncache_lwp(GC_current_ids[i]);
-                        GC_current_ids[i] = me; /* handle next time. */
-                    } else {
-                        while (!(status.pr_flags & PR_STOPPED)) {
-                            GC_msec_sleep(1);
-			    if (syscall(SYS_ioctl, lwp_fd,
-				    	PIOCSTATUS, &status) < 0) {
-                            	ABORT("Repeated PIOCSTATUS failed");
-			    }
-			    if (status.pr_flags & PR_STOPPED) break;
-			    
-			    GC_msec_sleep(20);
-			    if (syscall(SYS_ioctl, lwp_fd,
-				    	PIOCSTATUS, &status) < 0) {
-                            	ABORT("Repeated PIOCSTATUS failed");
-			    }
-                        }
-                        if (status.pr_who !=  GC_current_ids[i]) {
-				/* can happen if thread was on death row */
-				uncache_lwp(GC_current_ids[i]);
-				GC_current_ids[i] = me; /* handle next time. */
-				continue;	
-                        }
-                        /* Save registers where collector can */
-			/* find them.			  */
-			    BCOPY(status.pr_reg, GC_lwp_registers[i],
-				  sizeof (prgregset_t));
-                    }
-                }
-            }
-        }
-        if (!changed) break;
-        for (i = 0; i < max_lwps; i++) last_ids[i] = GC_current_ids[i];
-    }
-}
-
-/* Restart all lwps in process.  Assumes preemption is off.	*/
-static void restart_all_lwps()
-{
-    int lwp_fd;
-    register int i;
-    GC_bool changed;
-    lwpid_t me = _lwp_self();
-#   define PARANOID
-
-    for (i = 0; GC_current_ids[i] != 0; i++) {
-#	ifdef PARANOID
-	  if (GC_current_ids[i] != me) {
-	    int lwp_fd = open_lwp(GC_current_ids[i]);
-	    prstatus_t status;
-	    
-	    if (lwp_fd < 0) ABORT("open_lwp failed");
-	    if (syscall(SYS_ioctl, lwp_fd,
-			PIOCSTATUS, &status) < 0) {
-                ABORT("PIOCSTATUS failed in restart_all_lwps");
-	    }
-	    if (memcmp(status.pr_reg, GC_lwp_registers[i],
-		       sizeof (prgregset_t)) != 0) {
-		    int j;
-
-		    for(j = 0; j < NPRGREG; j++)
-		    {
-			    GC_printf3("%i: %x -> %x\n", j,
-				       GC_lwp_registers[i][j],
-				       status.pr_reg[j]);
-		    }
-		ABORT("Register contents changed");
-	    }
-	    if (!status.pr_flags & PR_STOPPED) {
-	    	ABORT("lwp no longer stopped");
-	    }
-#ifdef SPARC
-	    {
-		    gwindows_t windows;
-	      if (syscall(SYS_ioctl, lwp_fd,
-			PIOCGWIN, &windows) < 0) {
-                ABORT("PIOCSTATUS failed in restart_all_lwps");
-	      }
-	      if (windows.wbcnt > 0) ABORT("unsaved register windows");
-	    }
-#endif
-	  }
-#	endif /* PARANOID */
-	if (GC_current_ids[i] == me) continue;
-        if (_lwp_continue(GC_current_ids[i]) < 0) {
-            ABORT("Failed to restart lwp");
-        }
-    }
-    if (i >= max_lwps) ABORT("Too many lwps");
-}
-
-GC_bool GC_multithreaded = 0;
-
-void GC_stop_world()
-{
-    preempt_off();
-    if (GC_multithreaded)
-        stop_all_lwps();
-}
-
-void GC_start_world()
-{
-    if (GC_multithreaded)
-        restart_all_lwps();
-    preempt_on();
-}
-
-void GC_thr_init(void);
-
-GC_bool GC_thr_initialized = FALSE;
-
-size_t GC_min_stack_sz;
-
-
-/*
- * stack_head is stored at the top of free stacks
- */
-struct stack_head {
-	struct stack_head	*next;
-	ptr_t			base;
-	thread_t		owner;
-};
-
-# define N_FREE_LISTS 25
-struct stack_head *GC_stack_free_lists[N_FREE_LISTS] = { 0 };
-		/* GC_stack_free_lists[i] is free list for stacks of 	*/
-		/* size GC_min_stack_sz*2**i.				*/
-		/* Free lists are linked through stack_head stored	*/			/* at top of stack.					*/
-
-/* Return a stack of size at least *stack_size.  *stack_size is	*/
-/* replaced by the actual stack size.				*/
-/* Caller holds allocation lock.				*/
-ptr_t GC_stack_alloc(size_t * stack_size)
-{
-    register size_t requested_sz = *stack_size;
-    register size_t search_sz = GC_min_stack_sz;
-    register int index = 0;	/* = log2(search_sz/GC_min_stack_sz) */
-    register ptr_t base;
-    register struct stack_head *result;
-    
-    while (search_sz < requested_sz) {
-        search_sz *= 2;
-        index++;
-    }
-    if ((result = GC_stack_free_lists[index]) == 0
-        && (result = GC_stack_free_lists[index+1]) != 0) {
-        /* Try next size up. */
-        search_sz *= 2; index++;
-    }
-    if (result != 0) {
-        base =  GC_stack_free_lists[index]->base;
-        GC_stack_free_lists[index] = GC_stack_free_lists[index]->next;
-    } else {
-#ifdef MMAP_STACKS
-        base = (ptr_t)mmap(0, search_sz + GC_page_size,
-			     PROT_READ|PROT_WRITE, MAP_PRIVATE |MAP_NORESERVE,
-			     GC_zfd, 0);
-	if (base == (ptr_t)-1)
-	{
-		*stack_size = 0;
-		return NULL;
-	}
-
-	mprotect(base, GC_page_size, PROT_NONE);
-	/* Should this use divHBLKSZ(search_sz + GC_page_size) ? -- cf */
-	GC_is_fresh((struct hblk *)base, divHBLKSZ(search_sz));
-	base += GC_page_size;
-
-#else
-        base = (ptr_t) GC_scratch_alloc(search_sz + 2*GC_page_size);
-	if (base == NULL)
-	{
-		*stack_size = 0;
-		return NULL;
-	}
-
-        base = (ptr_t)(((word)base + GC_page_size) & ~(GC_page_size - 1));
-        /* Protect hottest page to detect overflow. */
-#	ifdef SOLARIS23_MPROTECT_BUG_FIXED
-            mprotect(base, GC_page_size, PROT_NONE);
-#	endif
-        GC_is_fresh((struct hblk *)base, divHBLKSZ(search_sz));
-
-        base += GC_page_size;
-#endif
-    }
-    *stack_size = search_sz;
-    return(base);
-}
-
-/* Caller holds  allocationlock.					*/
-void GC_stack_free(ptr_t stack, size_t size)
-{
-    register int index = 0;
-    register size_t search_sz = GC_min_stack_sz;
-    register struct stack_head *head;
-    
-#ifdef MMAP_STACKS
-    /* Zero pointers */
-    mmap(stack, size, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_NORESERVE|MAP_FIXED,
-	 GC_zfd, 0);
-#endif
-    while (search_sz < size) {
-        search_sz *= 2;
-        index++;
-    }
-    if (search_sz != size) ABORT("Bad stack size");
-
-    head = (struct stack_head *)(stack + search_sz - sizeof(struct stack_head));
-    head->next = GC_stack_free_lists[index];
-    head->base = stack;
-    GC_stack_free_lists[index] = head;
-}
-
-void GC_my_stack_limits();
-
-/* Notify virtual dirty bit implementation that known empty parts of	*/
-/* stacks do not contain useful data.					*/ 
-/* Caller holds allocation lock.					*/
-void GC_old_stacks_are_fresh()
-{
-/* No point in doing this for MMAP stacks - and pointers are zero'd out */
-/* by the mmap in GC_stack_free */
-#ifndef MMAP_STACKS
-    register int i;
-    register struct stack_head *s;
-    register ptr_t p;
-    register size_t sz;
-    register struct hblk * h;
-    int dummy;
-    
-    for (i = 0, sz= GC_min_stack_sz; i < N_FREE_LISTS;
-         i++, sz *= 2) {
-         for (s = GC_stack_free_lists[i]; s != 0; s = s->next) {
-             p = s->base;
-             h = (struct hblk *)(((word)p + HBLKSIZE-1) & ~(HBLKSIZE-1));
-             if ((ptr_t)h == p) {
-                 GC_is_fresh((struct hblk *)p, divHBLKSZ(sz));
-             } else {
-                 GC_is_fresh((struct hblk *)p, divHBLKSZ(sz) - 1);
-                 BZERO(p, (ptr_t)h - p);
-             }
-         }
-    }
-#endif /* MMAP_STACKS */
-    GC_my_stack_limits();
-}
-
-/* The set of all known threads.  We intercept thread creation and 	*/
-/* joins.  We never actually create detached threads.  We allocate all 	*/
-/* new thread stacks ourselves.  These allow us to maintain this	*/
-/* data structure.							*/
-
-# define THREAD_TABLE_SZ 128	/* Must be power of 2	*/
-volatile GC_thread GC_threads[THREAD_TABLE_SZ];
-
-void GC_push_thread_structures GC_PROTO((void))
-{
-    GC_push_all((ptr_t)(GC_threads), (ptr_t)(GC_threads)+sizeof(GC_threads));
-}
-
-/* Add a thread to GC_threads.  We assume it wasn't already there.	*/
-/* Caller holds allocation lock.					*/
-GC_thread GC_new_thread(thread_t id)
-{
-    int hv = ((word)id) % THREAD_TABLE_SZ;
-    GC_thread result;
-    static struct GC_Thread_Rep first_thread;
-    static GC_bool first_thread_used = FALSE;
-    
-    if (!first_thread_used) {
-    	result = &first_thread;
-    	first_thread_used = TRUE;
-    	/* Dont acquire allocation lock, since we may already hold it. */
-    } else {
-        result = (struct GC_Thread_Rep *)
-        	 GC_INTERNAL_MALLOC(sizeof(struct GC_Thread_Rep), NORMAL);
-    }
-    if (result == 0) return(0);
-    result -> id = id;
-    result -> next = GC_threads[hv];
-    GC_threads[hv] = result;
-    /* result -> finished = 0; */
-    (void) cond_init(&(result->join_cv), USYNC_THREAD, 0);
-    return(result);
-}
-
-/* Delete a thread from GC_threads.  We assume it is there.	*/
-/* (The code intentionally traps if it wasn't.)			*/
-/* Caller holds allocation lock.				*/
-void GC_delete_thread(thread_t id)
-{
-    int hv = ((word)id) % THREAD_TABLE_SZ;
-    register GC_thread p = GC_threads[hv];
-    register GC_thread prev = 0;
-    
-    while (p -> id != id) {
-        prev = p;
-        p = p -> next;
-    }
-    if (prev == 0) {
-        GC_threads[hv] = p -> next;
-    } else {
-        prev -> next = p -> next;
-    }
-}
-
-/* Return the GC_thread correpsonding to a given thread_t.	*/
-/* Returns 0 if it's not there.					*/
-/* Caller holds  allocation lock.				*/
-GC_thread GC_lookup_thread(thread_t id)
-{
-    int hv = ((word)id) % THREAD_TABLE_SZ;
-    register GC_thread p = GC_threads[hv];
-    
-    while (p != 0 && p -> id != id) p = p -> next;
-    return(p);
-}
-
-/* Solaris 2/Intel uses an initial stack size limit slightly bigger than the
-   SPARC default of 8 MB.  Account for this to warn only if the user has
-   raised the limit beyond the default.
-
-   This is identical to DFLSSIZ defined in <sys/vm_machparam.h>.  This file
-   is installed in /usr/platform/`uname -m`/include, which is not in the
-   default include directory list, so copy the definition here.  */
-#ifdef I386
-# define MAX_ORIG_STACK_SIZE (8 * 1024 * 1024 + ((USRSTACK) & 0x3FFFFF))
-#else
-# define MAX_ORIG_STACK_SIZE (8 * 1024 * 1024)
-#endif
-
-word GC_get_orig_stack_size() {
-    struct rlimit rl;
-    static int warned = 0;
-    int result;
-
-    if (getrlimit(RLIMIT_STACK, &rl) != 0) ABORT("getrlimit failed");
-    result = (word)rl.rlim_cur & ~(HBLKSIZE-1);
-    if (result > MAX_ORIG_STACK_SIZE) {
-	if (!warned) {
-	    WARN("Large stack limit(%ld): only scanning 8 MB\n", result);
-	    warned = 1;
-	}
-	result = MAX_ORIG_STACK_SIZE;
-    }
-    return result;
-}
-
-/* Notify dirty bit implementation of unused parts of my stack. */
-/* Caller holds allocation lock.				*/
-void GC_my_stack_limits()
-{
-    int dummy;
-    register ptr_t hottest = (ptr_t)((word)(&dummy) & ~(HBLKSIZE-1));
-    register GC_thread me = GC_lookup_thread(thr_self());
-    register size_t stack_size = me -> stack_size;
-    register ptr_t stack;
-    
-    if (stack_size == 0) {
-      /* original thread */
-        /* Empirically, what should be the stack page with lowest	*/
-        /* address is actually inaccessible.				*/
-        stack_size = GC_get_orig_stack_size() - GC_page_size;
-        stack = GC_stackbottom - stack_size + GC_page_size;
-    } else {
-        stack = me -> stack;
-    }
-    if (stack > hottest || stack + stack_size < hottest) {
-    	ABORT("sp out of bounds");
-    }
-    GC_is_fresh((struct hblk *)stack, divHBLKSZ(hottest - stack));
-}
-
-
-/* We hold allocation lock.  Should do exactly the right thing if the	*/
-/* world is stopped.  Should not fail if it isn't.			*/
-void GC_push_all_stacks()
-{
-    register int i;
-    register GC_thread p;
-    register ptr_t sp = GC_approx_sp();
-    register ptr_t bottom, top;
-    struct rlimit rl;
-    
-#   define PUSH(bottom,top) \
-      if (GC_dirty_maintained) { \
-	GC_push_selected((bottom), (top), GC_page_was_ever_dirty, \
-		      GC_push_all_stack); \
-      } else { \
-        GC_push_all_stack((bottom), (top)); \
-      }
-    GC_push_all_stack((ptr_t)GC_lwp_registers,
-		      (ptr_t)GC_lwp_registers
-		      + max_lwps * sizeof(GC_lwp_registers[0]));
-    for (i = 0; i < THREAD_TABLE_SZ; i++) {
-      for (p = GC_threads[i]; p != 0; p = p -> next) {
-        if (p -> stack_size != 0) {
-            bottom = p -> stack;
-            top = p -> stack + p -> stack_size;
-        } else {
-            /* The original stack. */
-            bottom = GC_stackbottom - GC_get_orig_stack_size() + GC_page_size;
-            top = GC_stackbottom;
-        }
-        if ((word)sp > (word)bottom && (word)sp < (word)top) bottom = sp;
-        PUSH(bottom, top);
-      }
-    }
-}
-
-
-int GC_is_thread_stack(ptr_t addr)
-{
-    register int i;
-    register GC_thread p;
-    register ptr_t bottom, top;
-    
-    for (i = 0; i < THREAD_TABLE_SZ; i++) {
-      for (p = GC_threads[i]; p != 0; p = p -> next) {
-        if (p -> stack_size != 0) {
-            if (p -> stack <= addr &&
-		addr < p -> stack + p -> stack_size)
-		    return 1;
-	}
-      }
-    }
-    return 0;
-}
-
-/* The only thread that ever really performs a thr_join.	*/
-void * GC_thr_daemon(void * dummy)
-{
-    void *status;
-    thread_t departed;
-    register GC_thread t;
-    register int i;
-    register int result;
-    
-    for(;;) {
-      start:
-        result = thr_join((thread_t)0, &departed, &status);
-    	LOCK();
-    	if (result != 0) {
-    	    /* No more threads; wait for create. */
-    	    for (i = 0; i < THREAD_TABLE_SZ; i++) {
-    	        for (t = GC_threads[i]; t != 0; t = t -> next) {
-                    if (!(t -> flags & (DETACHED | FINISHED))) {
-                      UNLOCK();
-                      goto start; /* Thread started just before we */
-                      		  /* acquired the lock.		   */
-                    }
-                }
-            }
-            cond_wait(&GC_create_cv, &GC_allocate_ml);
-            UNLOCK();
-    	} else {
-    	    t = GC_lookup_thread(departed);
-	    GC_multithreaded--;
-    	    if (!(t -> flags & CLIENT_OWNS_STACK)) {
-    	    	GC_stack_free(t -> stack, t -> stack_size);
-    	    }
-    	    if (t -> flags & DETACHED) {
-    	    	GC_delete_thread(departed);
-    	    } else {
-    	        t -> status = status;
-    	    	t -> flags |= FINISHED;
-    	    	cond_signal(&(t -> join_cv));
-    	    	cond_broadcast(&GC_prom_join_cv);
-    	    }
-    	    UNLOCK();
-    	}
-    }
-}
-
-/* We hold the allocation lock, or caller ensures that 2 instances	*/
-/* cannot be invoked concurrently.					*/
-void GC_thr_init(void)
-{
-    GC_thread t;
-    thread_t tid;
-
-    if (GC_thr_initialized)
-	    return;
-    GC_thr_initialized = TRUE;
-    GC_min_stack_sz = ((thr_min_stack() + 32*1024 + HBLKSIZE-1)
-    		       & ~(HBLKSIZE - 1));
-#ifdef MMAP_STACKS
-    GC_zfd = open("/dev/zero", O_RDONLY);
-    if (GC_zfd == -1)
-	    ABORT("Can't open /dev/zero");
-#endif /* MMAP_STACKS */
-    cond_init(&GC_prom_join_cv, USYNC_THREAD, 0);
-    cond_init(&GC_create_cv, USYNC_THREAD, 0);
-    /* Add the initial thread, so we can stop it.	*/
-      t = GC_new_thread(thr_self());
-      t -> stack_size = 0;
-      t -> flags = DETACHED | CLIENT_OWNS_STACK;
-    if (thr_create(0 /* stack */, 0 /* stack_size */, GC_thr_daemon,
-    		   0 /* arg */, THR_DETACHED | THR_DAEMON,
-    		   &tid /* thread_id */) != 0) {
-    	ABORT("Cant fork daemon");
-    }
-    thr_setprio(tid, 126);
-}
-
-/* We acquire the allocation lock to prevent races with 	*/
-/* stopping/starting world.					*/
-/* This is no more correct than the underlying Solaris 2.X	*/
-/* implementation.  Under 2.3 THIS IS BROKEN.			*/
-int GC_thr_suspend(thread_t target_thread)
-{
-    GC_thread t;
-    int result;
-    
-    LOCK();
-    result = thr_suspend(target_thread);
-    if (result == 0) {
-    	t = GC_lookup_thread(target_thread);
-    	if (t == 0) ABORT("thread unknown to GC");
-        t -> flags |= SUSPNDED;
-    }
-    UNLOCK();
-    return(result);
-}
-
-int GC_thr_continue(thread_t target_thread)
-{
-    GC_thread t;
-    int result;
-    
-    LOCK();
-    result = thr_continue(target_thread);
-    if (result == 0) {
-    	t = GC_lookup_thread(target_thread);
-    	if (t == 0) ABORT("thread unknown to GC");
-        t -> flags &= ~SUSPNDED;
-    }
-    UNLOCK();
-    return(result);
-}
-
-int GC_thr_join(thread_t wait_for, thread_t *departed, void **status)
-{
-    register GC_thread t;
-    int result = 0;
-    
-    LOCK();
-    if (wait_for == 0) {
-        register int i;
-        register GC_bool thread_exists;
-    
-    	for (;;) {
-    	  thread_exists = FALSE;
-    	  for (i = 0; i < THREAD_TABLE_SZ; i++) {
-    	    for (t = GC_threads[i]; t != 0; t = t -> next) {
-              if (!(t -> flags & DETACHED)) {
-                if (t -> flags & FINISHED) {
-                  goto found;
-                }
-                thread_exists = TRUE;
-              }
-            }
-          }
-          if (!thread_exists) {
-              result = ESRCH;
-    	      goto out;
-          }
-          cond_wait(&GC_prom_join_cv, &GC_allocate_ml);
-        }
-    } else {
-        t = GC_lookup_thread(wait_for);
-    	if (t == 0 || t -> flags & DETACHED) {
-    	    result = ESRCH;
-    	    goto out;
-    	}
-    	if (wait_for == thr_self()) {
-    	    result = EDEADLK;
-    	    goto out;
-    	}
-    	while (!(t -> flags & FINISHED)) {
-            cond_wait(&(t -> join_cv), &GC_allocate_ml);
-    	}
-    	
-    }
-  found:
-    if (status) *status = t -> status;
-    if (departed) *departed = t -> id;
-    cond_destroy(&(t -> join_cv));
-    GC_delete_thread(t -> id);
-  out:
-    UNLOCK();
-    return(result);
-}
-
-
-int
-GC_thr_create(void *stack_base, size_t stack_size,
-              void *(*start_routine)(void *), void *arg, long flags,
-              thread_t *new_thread)
-{
-    int result;
-    GC_thread t;
-    thread_t my_new_thread;
-    word my_flags = 0;
-    void * stack = stack_base;
-   
-    LOCK();
-    if (!GC_is_initialized) GC_init_inner();
-    GC_multithreaded++;
-    if (stack == 0) {
-     	if (stack_size == 0) stack_size = 1024*1024;
-     	stack = (void *)GC_stack_alloc(&stack_size);
-     	if (stack == 0) {
-	    GC_multithreaded--;
-     	    UNLOCK();
-     	    return(ENOMEM);
-     	}
-    } else {
-    	my_flags |= CLIENT_OWNS_STACK;
-    }
-    if (flags & THR_DETACHED) my_flags |= DETACHED;
-    if (flags & THR_SUSPENDED) my_flags |= SUSPNDED;
-    result = thr_create(stack, stack_size, start_routine,
-   		        arg, flags & ~THR_DETACHED, &my_new_thread);
-    if (result == 0) {
-        t = GC_new_thread(my_new_thread);
-        t -> flags = my_flags;
-        if (!(my_flags & DETACHED)) cond_init(&(t -> join_cv), USYNC_THREAD, 0);
-        t -> stack = stack;
-        t -> stack_size = stack_size;
-        if (new_thread != 0) *new_thread = my_new_thread;
-        cond_signal(&GC_create_cv);
-    } else {
-	GC_multithreaded--;
-        if (!(my_flags & CLIENT_OWNS_STACK)) {
-      	    GC_stack_free(stack, stack_size);
-	}
-    }        
-    UNLOCK();  
-    return(result);
-}
-
-# else /* !GC_SOLARIS_THREADS */
-
-#ifndef LINT
-  int GC_no_sunOS_threads;
-#endif
-#endif