#include <string.h>
#include <libgen.h>
#include <sys/types.h>
+#include <sys/wait.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/file.h>
#include <sys/param.h>
#include <sys/stat.h>
+#include <signal.h>
+#include <sys/ptrace.h>
+#include <sched.h>
+#include <errno.h>
#if defined(SVR4) || defined(__linux__)
#include <time.h>
#include "core.h"
#include "save.h"
#include "lispregs.h"
+#include "thread.h"
#include "genesis/static-symbols.h"
#include "genesis/symbol.h"
", SBCL_VERSION_STRING);
}
\f
+int gc_thread_pid;
+FILE *stdlog;
+
+\f
int
main(int argc, char *argv[], char *envp[])
{
gc_initialize_pointers();
-#ifdef BINDING_STACK_POINTER
- SetSymbolValue(BINDING_STACK_POINTER, BINDING_STACK_START);
-#endif
-
interrupt_init();
-
arch_install_interrupt_handlers();
os_install_interrupt_handlers();
-#ifdef PSEUDO_ATOMIC_ATOMIC
- /* Turn on pseudo atomic for when we call into Lisp. */
- SHOW("turning on pseudo atomic");
- SetSymbolValue(PSEUDO_ATOMIC_ATOMIC, make_fixnum(1));
- SetSymbolValue(PSEUDO_ATOMIC_INTERRUPTED, make_fixnum(0));
-#endif
-
/* Convert remaining argv values to something that Lisp can grok. */
SHOW("setting POSIX-ARGV symbol value");
- SetSymbolValue(POSIX_ARGV, alloc_string_list(argv));
+ SetSymbolValue(POSIX_ARGV, alloc_string_list(argv),0);
/* Install a handler to pick off SIGINT until the Lisp system gets
* far enough along to install its own handler. */
sigint_init();
FSHOW((stderr, "/funcalling initial_function=0x%lx\n", initial_function));
- funcall0(initial_function);
+ create_thread(initial_function);
+ /* in a unithread build, create_thread never returns */
+#ifdef LISP_FEATURE_SB_THREAD
+ gc_thread_pid=getpid();
+ parent_loop();
+#endif
+}
- /* initial_function() is not supposed to return. */
- lose("Lisp initial_function gave up control.");
- return 0; /* dummy value: return something */
+static void parent_sighandler(int signum,siginfo_t *info, void *void_context)
+{
+#if 0
+ os_context_t *context = (os_context_t*)void_context;
+ fprintf(stderr,
+ "parent thread got signal %d from %d, maybe_gc_pending=%d\n",
+ signum, info->si_pid,
+ maybe_gc_pending);
+#endif
}
+#ifdef LISP_FEATURE_SB_THREAD
+static void parent_do_garbage_collect(void)
+{
+ int waiting_threads=0;
+ struct thread *th;
+ int status,p;
+
+ for_each_thread(th) {
+ if(ptrace(PTRACE_ATTACH,th->pid,0,0)) {
+ fprintf(stderr,"attaching to %d ...",th->pid);
+ perror("PTRACE_ATTACH");
+ }
+ else waiting_threads++;
+ }
+ stop_the_world=1;
+
+ do {
+ /* not sure if we have to wait for PTRACE_ATTACH to finish
+ * before we can send PTRACE_CONT, so let's play it safe
+ */
+ while(waiting_threads>0) {
+ if((p=waitpid(-1,&status, WUNTRACED|__WALL))>0) {
+ if(WIFEXITED(status) || WIFSIGNALED(status))
+ destroy_thread(find_thread_by_pid(p));
+ else {
+#if 0
+ fprintf(stderr, "wait returned pid %d signal %x\n",
+ p,WSTOPSIG(status));
+#endif
+ if(WSTOPSIG(status)==SIGTRAP) {
+ if(ptrace(PTRACE_CONT,p,0,SIGTRAP))
+ perror("PTRACE_CONT");
+ }
+ else waiting_threads--;
+ }
+ }
+ }
+ for_each_thread(th) {
+ if(SymbolTlValue(PSEUDO_ATOMIC_ATOMIC,th)) {
+ /* restart the child, setting *p-a-i* which will cause it
+ * to go into interrupt_handle_pending as soon as it's
+ * finished being pseudo_atomic. once there it will
+ * signal itself SIGSTOP, which will give us another
+ * event to wait for */
+ fprintf(stderr, "%d was pseudo-atomic, letting it resume \n",
+ th->pid);
+ SetTlSymbolValue(PSEUDO_ATOMIC_INTERRUPTED,1,th) ;
+ if(ptrace(PTRACE_CONT,th->pid,0,0))
+ perror("PTRACE_CONT");
+ waiting_threads++;
+ }
+ }
+ } while (waiting_threads>0);
+
+ collect_garbage(maybe_gc_pending-1);
+ maybe_gc_pending=0;
+ stop_the_world=0;
+ /* fprintf(stderr, "gc done\n"); */
+ for_each_thread(th)
+ if(ptrace(PTRACE_DETACH,th->pid,0,0))
+ perror("PTRACE_DETACH");
+}
+
+static void /* noreturn */ parent_loop(void)
+{
+ struct sigaction sa;
+ sigset_t sigset;
+ int status;
+
+ sigemptyset(&sigset);
+
+ sigaddset(&sigset, SIGALRM);
+ sigaddset(&sigset, SIGCHLD);
+ sigprocmask(SIG_UNBLOCK,&sigset,0);
+ sa.sa_handler=parent_sighandler;
+ sa.sa_mask=sigset;
+ sa.sa_flags=SA_SIGINFO;
+ sigaction(SIGALRM, &sa, 0);
+ sigaction(SIGCHLD, &sa, 0);
+
+ sigemptyset(&sigset);
+ sa.sa_handler=SIG_IGN;
+ sa.sa_mask=sigset;
+ sa.sa_flags=0;
+ sigaction(SIGINT, &sa, 0);
+
+ while(all_threads) {
+ pid_t pid=0;
+ while(pid=waitpid(-1,&status,__WALL|WUNTRACED)) {
+ struct thread *th;
+ fprintf(stderr,"waitpid pid %d\n",pid);
+ if(pid==-1) {
+ if(errno == EINTR) {
+ if(maybe_gc_pending) parent_do_garbage_collect();
+ continue;
+ }
+ if(errno == ECHILD) break;
+ fprintf(stderr,"waitpid: %s\n",strerror(errno));
+ continue;
+ }
+ th=find_thread_by_pid(pid);
+ if(!th) continue;
+ if(WIFEXITED(status) || WIFSIGNALED(status)) {
+ fprintf(stderr,"waitpid : child %d %x exited \n", pid,th);
+ destroy_thread(th);
+ /* FIXME arrange to call or fake (free-mutex *session-lock*)
+ * if necessary */
+ if(!all_threads) break;
+ }
+ }
+ }
+ exit(WEXITSTATUS(status));
+}
+
+#endif
projects / sbcl.git / blobdiff