gencgc: More precise conservatism for pointers to boxed pages.

[sbcl.git] / src / runtime / linux-os.c

diff --git a/src/runtime/linux-os.c b/src/runtime/linux-os.c
index db72fa6..a23bc5d 100644 (file)
--- a/src/runtime/linux-os.c
+++ b/src/runtime/linux-os.c
@@ -55,6 +55,10 @@
 #else
 #include "cheneygc-internal.h"
 #endif
+#include <fcntl.h>
+#ifdef LISP_FEATURE_SB_WTIMER
+# include <sys/timerfd.h>
+#endif
 
 #ifdef LISP_FEATURE_X86
 /* Prototype for personality(2). Done inline here since the header file
@@ -64,7 +68,7 @@ int personality (unsigned long);
 
 size_t os_vm_page_size;
 
-#if defined(LISP_FEATURE_SB_THREAD) && !defined(LISP_FEATURE_SB_LUTEX) && !defined(LISP_FEATURE_SB_PTHREAD_FUTEX)
+#if defined(LISP_FEATURE_SB_THREAD) && defined(LISP_FEATURE_SB_FUTEX) && !defined(LISP_FEATURE_SB_PTHREAD_FUTEX)
 #include <sys/syscall.h>
 #include <unistd.h>
 #include <errno.h>
@@ -198,12 +202,18 @@ os_init(char *argv[], char *envp[])
     int patch_version;
     char *p;
     uname(&name);
+
     p=name.release;
     major_version = atoi(p);
-    p=strchr(p,'.')+1;
-    minor_version = atoi(p);
-    p=strchr(p,'.')+1;
-    patch_version = atoi(p);
+    minor_version = patch_version = 0;
+    p=strchr(p,'.');
+    if (p != NULL) {
+            minor_version = atoi(++p);
+            p=strchr(p,'.');
+            if (p != NULL)
+                    patch_version = atoi(++p);
+    }
+
     if (major_version<2) {
         lose("linux kernel version too old: major version=%d (can't run in version < 2.0.0)\n",
              major_version);
@@ -215,7 +225,7 @@ os_init(char *argv[], char *envp[])
 #endif
     }
 #ifdef LISP_FEATURE_SB_THREAD
-#if !defined(LISP_FEATURE_SB_LUTEX) && !defined(LISP_FEATURE_SB_PTHREAD_FUTEX)
+#if defined(LISP_FEATURE_SB_FUTEX) && !defined(LISP_FEATURE_SB_PTHREAD_FUTEX)
     futex_init();
 #endif
     if(! isnptl()) {
@@ -263,7 +273,9 @@ os_init(char *argv[], char *envp[])
              * in an error or if the value didn't change. Otherwise
              * this might result in an infinite loop.
              */
-            if (retval != -1 && newpers != pers) {
+
+            if (!getenv("SBCL_IS_RESTARTING") &&
+                retval != -1 && newpers != pers) {
                 /* Use /proc/self/exe instead of trying to figure out
                  * the executable path from PATH and argv[0], since
                  * that's unreliable. We follow the symlink instead of
@@ -272,15 +284,21 @@ os_init(char *argv[], char *envp[])
                 char runtime[PATH_MAX+1];
                 int i = readlink("/proc/self/exe", runtime, PATH_MAX);
                 if (i != -1) {
+                    environ = envp;
+                    setenv("SBCL_IS_RESTARTING", "T", 1);
                     runtime[i] = '\0';
-                    execve(runtime, argv, envp);
+                    execv(runtime, argv);
                 }
             }
             /* Either changing the personality or execve() failed. Either
              * way we might as well continue, and hope that the random
              * memory maps are ok this time around.
              */
-            fprintf(stderr, "WARNING: Couldn't re-execute SBCL with the proper personality flags (maybe /proc isn't mounted?). Trying to continue anyway.\n");
+            fprintf(stderr, "WARNING:\
+\nCouldn't re-execute SBCL with proper personality flags (/proc isn't mounted? setuid?)\
+\nTrying to continue anyway.\n");
+        } else {
+            unsetenv("SBCL_IS_RESTARTING");
         }
     }
 #ifdef LISP_FEATURE_X86
@@ -429,6 +447,10 @@ sigsegv_handler(int signal, siginfo_t *info, os_context_t *context)
     }
 #endif
 
+#ifdef LISP_FEATURE_SB_SAFEPOINT
+    if (!handle_safepoint_violation(context, addr))
+#endif
+
 #ifdef LISP_FEATURE_GENCGC
     if (!gencgc_handle_wp_violation(addr))
 #else
@@ -443,9 +465,18 @@ os_install_interrupt_handlers(void)
 {
     undoably_install_low_level_interrupt_handler(SIG_MEMORY_FAULT,
                                                  sigsegv_handler);
+
+    /* OAOOM c.f. sunos-os.c.
+     * Should we have a reusable function gc_install_interrupt_handlers? */
 #ifdef LISP_FEATURE_SB_THREAD
+# ifdef LISP_FEATURE_SB_SAFEPOINT
+#  ifdef LISP_FEATURE_SB_THRUPTION
+    undoably_install_low_level_interrupt_handler(SIGPIPE, thruption_handler);
+#  endif
+# else
     undoably_install_low_level_interrupt_handler(SIG_STOP_FOR_GC,
                                                  sig_stop_for_gc_handler);
+# endif
 #endif
 }
 
@@ -463,3 +494,61 @@ os_get_runtime_executable_path(int external)
 
     return copied_string(path);
 }
+
+#ifdef LISP_FEATURE_SB_WTIMER
+/*
+ * Waitable timer implementation for the safepoint-based (SIGALRM-free)
+ * timer facility using timerfd_create().
+ */
+int
+os_create_wtimer()
+{
+    int fd = timerfd_create(CLOCK_MONOTONIC, 0);
+    if (fd == -1)
+        lose("os_create_wtimer: timerfd_create");
+
+    /* Cannot count on TFD_CLOEXEC availability, so do it manually: */
+    if (fcntl(fd, F_SETFD, FD_CLOEXEC) == -1)
+        lose("os_create_wtimer: fcntl");
+
+    return fd;
+}
+
+int
+os_wait_for_wtimer(int fd)
+{
+    unsigned char buf[8];
+    int n = read(fd, buf, sizeof(buf));
+    if (n == -1) {
+        if (errno == EINTR)
+            return -1;
+        lose("os_wtimer_listen failed");
+    }
+    if (n != sizeof(buf))
+        lose("os_wtimer_listen read too little");
+    return 0;
+}
+
+void
+os_close_wtimer(int fd)
+{
+    if (close(fd) == -1)
+        lose("os_close_wtimer failed");
+}
+
+void
+os_set_wtimer(int fd, int sec, int nsec)
+{
+    struct itimerspec spec = { {0,0}, {0,0} };
+    spec.it_value.tv_sec = sec;
+    spec.it_value.tv_nsec = nsec;
+    if (timerfd_settime(fd, 0, &spec, 0) == -1)
+        lose("timerfd_settime");
+}
+
+void
+os_cancel_wtimer(int fd)
+{
+    os_set_wtimer(fd, 0, 0);
+}
+#endif