+++ /dev/null
-/*
- * 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>
-
-/*
- * 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 < NGREG; 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 |= SUSPENDED;
- }
- 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 &= ~SUSPENDED;
- }
- 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 |= SUSPENDED;
- 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
projects / msp430-gcc.git / blobdiff