X-Git-Url: http://repo.macrolet.net/gitweb/?a=blobdiff_plain;ds=sidebyside;f=src%2Fruntime%2Fthread.c;h=86626826916b3d75c38d258e9369c21b5259734c;hb=d0511d2a94e7d2d346e2f4acc38ff84cd99a74b1;hp=8ac0519f71e1267e8859ae28053b9216d7bf7732;hpb=dcf5978d9d33098e868ae6eea28e1b310038c03d;p=sbcl.git diff --git a/src/runtime/thread.c b/src/runtime/thread.c index 8ac0519..8662682 100644 --- a/src/runtime/thread.c +++ b/src/runtime/thread.c @@ -1,14 +1,15 @@ #include #include +#include #include #include #include #include -#ifndef CLONE_PARENT /* lameass glibc 2.2 doesn't define this */ -#define CLONE_PARENT 0x00008000 /* even though the manpage documents it */ -#endif -#include "runtime.h" +#include +#include + #include "sbcl.h" +#include "runtime.h" #include "validate.h" /* for CONTROL_STACK_SIZE etc */ #include "thread.h" #include "arch.h" @@ -17,15 +18,34 @@ #include "globals.h" #include "dynbind.h" #include "genesis/cons.h" +#include "genesis/fdefn.h" +#include "interr.h" /* for lose() */ +#include "gc-internal.h" + #define ALIEN_STACK_SIZE (1*1024*1024) /* 1Mb size chosen at random */ int dynamic_values_bytes=4096*sizeof(lispobj); /* same for all threads */ struct thread *all_threads; volatile lispobj all_threads_lock; -volatile int countdown_to_gc; extern struct interrupt_data * global_interrupt_data; -void get_spinlock(lispobj *word,int value); +int +initial_thread_trampoline(struct thread *th) +{ + lispobj function; + lispobj *args = NULL; + function = th->unbound_marker; + th->unbound_marker = UNBOUND_MARKER_WIDETAG; + if(arch_os_thread_init(th)==0) return 1; + + if(th->pid < 1) lose("th->pid not set up right"); + th->state=STATE_RUNNING; +#if defined(LISP_FEATURE_X86) + return call_into_lisp_first_time(function,args,0); +#else + return funcall0(function); +#endif +} /* this is the first thing that clone() runs in the child (which is * why the silly calling convention). Basically it calls the user's @@ -33,51 +53,32 @@ void get_spinlock(lispobj *word,int value); * whatever other bookkeeping needs to be done */ -/* set go to 0 to stop the thread before it starts. Convenient if you -* want to attach a debugger to it before it does anything */ -volatile int go=1; - +#ifdef LISP_FEATURE_SB_THREAD int new_thread_trampoline(struct thread *th) { lispobj function; - lispobj *args = NULL; function = th->unbound_marker; - if(go==0) { - fprintf(stderr, "/pausing 0x%lx(%d,%d) before new_thread_trampoline(0x%lx)\n", - (unsigned long)th,th->pid,getpid(),(unsigned long)function); - while(go==0) ; - fprintf(stderr, "/continue\n"); - } th->unbound_marker = UNBOUND_MARKER_WIDETAG; - if(arch_os_thread_init(th)==0) - return 1; /* failure. no, really */ -#ifdef LISP_FEATURE_SB_THREAD + if(arch_os_thread_init(th)==0) return 1; + /* wait here until our thread is linked into all_threads: see below */ while(th->pid<1) sched_yield(); -#else - if(th->pid < 1) - lose("th->pid not set up right"); -#endif th->state=STATE_RUNNING; -#if !defined(LISP_FEATURE_SB_THREAD) && defined(LISP_FEATURE_X86) - return call_into_lisp_first_time(function,args,0); -#else return funcall0(function); -#endif } +#endif /* LISP_FEATURE_SB_THREAD */ /* this is called from any other thread to create the new one, and * initialize all parts of it that can be initialized from another * thread */ -pid_t create_thread(lispobj initial_function) { +struct thread * create_thread_struct(lispobj initial_function) { union per_thread_data *per_thread; struct thread *th=0; /* subdue gcc */ void *spaces=0; - pid_t kid_pid; /* may as well allocate all the spaces at once: it saves us from * having to decide what to do if only some of the allocations @@ -159,13 +160,13 @@ pid_t create_thread(lispobj initial_function) { * we use the appropriate SymbolValue macros to access any of the * variable quantities from the C runtime. It's not quite OAOOM, * it just feels like it */ - SetSymbolValue(BINDING_STACK_START,th->binding_stack_start,th); - SetSymbolValue(CONTROL_STACK_START,th->control_stack_start,th); - SetSymbolValue(CONTROL_STACK_END,th->control_stack_end,th); + SetSymbolValue(BINDING_STACK_START,(lispobj)th->binding_stack_start,th); + SetSymbolValue(CONTROL_STACK_START,(lispobj)th->control_stack_start,th); + SetSymbolValue(CONTROL_STACK_END,(lispobj)th->control_stack_end,th); #ifdef LISP_FEATURE_X86 - SetSymbolValue(BINDING_STACK_POINTER,th->binding_stack_pointer,th); - SetSymbolValue(ALIEN_STACK,th->alien_stack_pointer,th); - SetSymbolValue(PSEUDO_ATOMIC_ATOMIC,th->pseudo_atomic_atomic,th); + SetSymbolValue(BINDING_STACK_POINTER,(lispobj)th->binding_stack_pointer,th); + SetSymbolValue(ALIEN_STACK,(lispobj)th->alien_stack_pointer,th); + SetSymbolValue(PSEUDO_ATOMIC_ATOMIC,(lispobj)th->pseudo_atomic_atomic,th); SetSymbolValue(PSEUDO_ATOMIC_INTERRUPTED,th->pseudo_atomic_interrupted,th); #else current_binding_stack_pointer=th->binding_stack_pointer; @@ -188,21 +189,22 @@ pid_t create_thread(lispobj initial_function) { sizeof (struct interrupt_data)); th->unbound_marker=initial_function; -#ifdef LISP_FEATURE_SB_THREAD -#if defined(LISP_FEATURE_X86) && defined (LISP_FEATURE_LINUX) - kid_pid= - clone(new_thread_trampoline, - (((void*)th->control_stack_start)+THREAD_CONTROL_STACK_SIZE-4), - (((getpid()!=parent_pid)?(CLONE_PARENT):0) - |CLONE_FILES|SIGALRM|CLONE_VM),th); - if(kid_pid<=0) - goto cleanup; -#else -#error this stuff presently only works on x86 Linux -#endif -#else - kid_pid=getpid(); -#endif + return th; + cleanup: + /* if(th && th->tls_cookie>=0) os_free_tls_pointer(th); */ + if(spaces) os_invalidate(spaces, + THREAD_CONTROL_STACK_SIZE+BINDING_STACK_SIZE+ + ALIEN_STACK_SIZE+dynamic_values_bytes); + return 0; +} + +void link_thread(struct thread *th,pid_t kid_pid) +{ + sigset_t newset,oldset; + sigemptyset(&newset); + sigaddset_blockable(&newset); + sigprocmask(SIG_BLOCK, &newset, &oldset); + get_spinlock(&all_threads_lock,kid_pid); th->next=all_threads; all_threads=th; @@ -211,37 +213,61 @@ pid_t create_thread(lispobj initial_function) { */ protect_control_stack_guard_page(th->pid,1); release_spinlock(&all_threads_lock); + + sigprocmask(SIG_SETMASK,&oldset,0); th->pid=kid_pid; /* child will not start until this is set */ -#ifndef LISP_FEATURE_SB_THREAD - new_thread_trampoline(all_threads); /* call_into_lisp */ - lose("Clever child? Idiot savant, verging on the."); -#endif +} - return th->pid; - cleanup: - /* if(th && th->tls_cookie>=0) os_free_tls_pointer(th); */ - if(spaces) os_invalidate(spaces, - THREAD_CONTROL_STACK_SIZE+BINDING_STACK_SIZE+ - ALIEN_STACK_SIZE+dynamic_values_bytes); - return 0; +void create_initial_thread(lispobj initial_function) { + struct thread *th=create_thread_struct(initial_function); + pid_t kid_pid=getpid(); + if(th && kid_pid>0) { + link_thread(th,kid_pid); + initial_thread_trampoline(all_threads); /* no return */ + } else lose("can't create initial thread"); +} + +#ifdef LISP_FEATURE_SB_THREAD +pid_t create_thread(lispobj initial_function) { + struct thread *th=create_thread_struct(initial_function); + pid_t kid_pid=0; + + if(th==0) return 0; + kid_pid=clone(new_thread_trampoline, + (((void*)th->control_stack_start)+ + THREAD_CONTROL_STACK_SIZE-4), + CLONE_FILES|SIG_THREAD_EXIT|CLONE_VM,th); + + if(kid_pid>0) { + link_thread(th,kid_pid); + return th->pid; + } else { + os_invalidate((os_vm_address_t) th->control_stack_start, + ((sizeof (lispobj)) + * (th->control_stack_end-th->control_stack_start)) + + BINDING_STACK_SIZE+ALIEN_STACK_SIZE+dynamic_values_bytes+ + 32*SIGSTKSZ); + return 0; + } } +#endif +/* unused */ void destroy_thread (struct thread *th) { /* precondition: the unix task has already been killed and exited. - * This is called by the parent */ + * This is called by the parent or some other thread */ #ifdef LISP_FEATURE_GENCGC gc_alloc_update_page_tables(0, &th->alloc_region); #endif get_spinlock(&all_threads_lock,th->pid); - if(countdown_to_gc>0) countdown_to_gc--; - th->state=STATE_STOPPED; + th->unbound_marker=0; /* for debugging */ if(th==all_threads) all_threads=th->next; else { struct thread *th1=all_threads; - while(th1->next!=th) th1=th1->next; - th1->next=th->next; /* unlink */ + while(th1 && th1->next!=th) th1=th1->next; + if(th1) th1->next=th->next; /* unlink */ } release_spinlock(&all_threads_lock); if(th && th->tls_cookie>=0) arch_os_thread_cleanup(th); @@ -252,7 +278,6 @@ void destroy_thread (struct thread *th) 32*SIGSTKSZ); } - struct thread *find_thread_by_pid(pid_t pid) { struct thread *th; @@ -261,10 +286,54 @@ struct thread *find_thread_by_pid(pid_t pid) return 0; } +#if defined LISP_FEATURE_SB_THREAD +/* This is not needed unless #+SB-THREAD, as there's a trivial null + * unithread definition. */ + +void mark_dead_threads() +{ + pid_t kid; + int status; + while(1) { + kid=waitpid(-1,&status,__WALL|WNOHANG); + if(kid<=0) break; + if(WIFEXITED(status) || WIFSIGNALED(status)) { + struct thread *th=find_thread_by_pid(kid); + if(th) th->state=STATE_DEAD; + } + } +} + +void reap_dead_threads() +{ + struct thread *th,*next,*prev=0; + th=all_threads; + while(th) { + next=th->next; + if(th->state==STATE_DEAD) { + funcall1(SymbolFunction(HANDLE_THREAD_EXIT),make_fixnum(th->pid)); +#ifdef LISP_FEATURE_GENCGC + gc_alloc_update_page_tables(0, &th->alloc_region); +#endif + get_spinlock(&all_threads_lock,th->pid); + if(prev) prev->next=next; + else all_threads=next; + release_spinlock(&all_threads_lock); + if(th->tls_cookie>=0) arch_os_thread_cleanup(th); + os_invalidate((os_vm_address_t) th->control_stack_start, + ((sizeof (lispobj)) + * (th->control_stack_end-th->control_stack_start)) + + BINDING_STACK_SIZE+ALIEN_STACK_SIZE+dynamic_values_bytes+ + 32*SIGSTKSZ); + } else + prev=th; + th=next; + } +} + /* These are not needed unless #+SB-THREAD, and since sigwaitinfo() * doesn't seem to be easily available everywhere (OpenBSD...) it's * more trouble than it's worth to compile it when not needed. */ -#if defined LISP_FEATURE_SB_THREAD void block_sigcont(void) { /* don't allow ourselves to receive SIGCONT while we're in the @@ -291,9 +360,12 @@ void unblock_sigcont_and_sleep(void) int interrupt_thread(pid_t pid, lispobj function) { union sigval sigval; + struct thread *th; sigval.sival_int=function; - - return sigqueue(pid, SIG_INTERRUPT_THREAD, sigval); + for_each_thread(th) + if((th->pid==pid) && (th->state != STATE_DEAD)) + return sigqueue(pid, SIG_INTERRUPT_THREAD, sigval); + errno=EPERM; return -1; } int signal_thread_to_dequeue (pid_t pid) @@ -303,11 +375,9 @@ int signal_thread_to_dequeue (pid_t pid) /* stopping the world is a two-stage process. From this thread we signal - * all the others with SIG_STOP_FOR_GC. The handler for this thread does + * all the others with SIG_STOP_FOR_GC. The handler for this signal does * the usual pseudo-atomic checks (we don't want to stop a thread while * it's in the middle of allocation) then kills _itself_ with SIGSTOP. - * At any given time, countdown_to_gc should reflect the number of threads - * signalled but which haven't yet come to rest */ void gc_stop_the_world() @@ -315,34 +385,27 @@ void gc_stop_the_world() /* stop all other threads by sending them SIG_STOP_FOR_GC */ struct thread *p,*th=arch_os_get_current_thread(); pid_t old_pid; - int finished=0; + int finished; do { - get_spinlock(&all_threads_lock,th->pid); + finished=1; for(p=all_threads,old_pid=p->pid; p; p=p->next) { if(p==th) continue; - if(p->state!=STATE_RUNNING) continue; - countdown_to_gc++; - p->state=STATE_STOPPING; - /* Note no return value check from kill(). If the - * thread had been reaped already, we kill it and - * increment countdown_to_gc anyway. This is to avoid - * complicating the logic in destroy_thread, which would - * otherwise have to know whether the thread died before or - * after it was killed - */ - kill(p->pid,SIG_STOP_FOR_GC); + if(p->state==STATE_RUNNING) { + p->state=STATE_STOPPING; + if(kill(p->pid,SIG_STOP_FOR_GC)==-1) { + /* we can't kill the process; assume because it + * died already (and its parent is dead so never + * saw the SIGCHLD) */ + p->state=STATE_DEAD; + } + } + if((p->state!=STATE_STOPPED) && + (p->state!=STATE_DEAD)) { + finished=0; + } } - release_spinlock(&all_threads_lock); - sched_yield(); - /* if everything has stopped, and there is no possibility that - * a new thread has been created, we're done. Otherwise go - * round again and signal anything that sprang up since last - * time */ - if(old_pid==all_threads->pid) { - finished=1; - for_each_thread(p) - finished = finished && - ((p==th) || (p->state==STATE_STOPPED)); + if(old_pid!=all_threads->pid) { + finished=0; } } while(!finished); } @@ -350,12 +413,14 @@ void gc_stop_the_world() void gc_start_the_world() { struct thread *p,*th=arch_os_get_current_thread(); - get_spinlock(&all_threads_lock,th->pid); + /* if a resumed thread creates a new thread before we're done with + * this loop, the new thread will get consed on the front of * + * all_threads_lock, but it won't have been stopped so won't need + * restarting */ for(p=all_threads;p;p=p->next) { - if(p==th) continue; + if((p==th) || (p->state==STATE_DEAD)) continue; p->state=STATE_RUNNING; - kill(p->pid,SIGCONT); + kill(p->pid,SIG_STOP_FOR_GC); } - release_spinlock(&all_threads_lock); } #endif