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Diffstat (limited to 'gc/solaris_threads.c')
| -rw-r--r-- | gc/solaris_threads.c | 956 |
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 |