X-Git-Url: http://repo.macrolet.net/gitweb/?a=blobdiff_plain;f=src%2Fruntime%2Flinux-os.c;h=4a3f99491ca450c561a6235ecd30e03fe361d7dc;hb=29a168e2bf7a6d509dea282cc5c781aba734d87c;hp=faf1a4729c1a4688a982a2af9a9e3f039283b131;hpb=402958f92506b9d3de852601b8c1ccb99b5ee558;p=sbcl.git

diff --git a/src/runtime/linux-os.c b/src/runtime/linux-os.c
index faf1a47..4a3f994 100644
--- a/src/runtime/linux-os.c
+++ b/src/runtime/linux-os.c
@@ -52,6 +52,8 @@
 #include "gc.h"
 #if defined LISP_FEATURE_GENCGC
 #include "gencgc-internal.h"
+#else
+#include "cheneygc-internal.h"
 #endif
 
 #ifdef LISP_FEATURE_X86
@@ -62,7 +64,7 @@ int personality (unsigned long);
 
 size_t os_vm_page_size;
 
-#if defined(LISP_FEATURE_SB_THREAD) && !defined(LISP_FEATURE_SB_LUTEX)
+#if defined(LISP_FEATURE_SB_THREAD) && !defined(LISP_FEATURE_SB_LUTEX) && !defined(LISP_FEATURE_SB_PTHREAD_FUTEX)
 #include <sys/syscall.h>
 #include <unistd.h>
 #include <errno.h>
@@ -82,10 +84,30 @@ static inline int sys_futex (void *futex, int op, int val, struct timespec *rel)
 }
 
 int
-futex_wait(int *lock_word, int oldval)
+futex_wait(int *lock_word, int oldval, long sec, unsigned long usec)
 {
-    int t= sys_futex(lock_word,FUTEX_WAIT,oldval, 0);
-    return t;
+  struct timespec timeout;
+  int t;
+
+ again:
+  if (sec<0) {
+    t = sys_futex(lock_word,FUTEX_WAIT,oldval, 0);
+  }
+  else {
+    timeout.tv_sec = sec;
+    timeout.tv_nsec = usec * 1000;
+    t = sys_futex(lock_word,FUTEX_WAIT,oldval, &timeout);
+  }
+  if (t==0)
+      return 0;
+  else if (errno==ETIMEDOUT)
+      return 1;
+  else if (errno==EINTR)
+      /* spurious wakeup from interrupt */
+      goto again;
+  else
+      /* EWOULDBLOCK and others, need to check the lock */
+      return -1;
 }
 
 int
@@ -98,6 +120,21 @@ futex_wake(int *lock_word, int n)
 
 int linux_sparc_siginfo_bug = 0;
 
+/* This variable was in real use for a few months, basically for
+ * storing autodetected information about whether the Linux
+ * installation was recent enough to support SBCL threads, and make
+ * some run-time decisions based on that. But this turned out to be
+ * unstable, so now we just flat-out refuse to start on the old installations
+ * when thread support has been compiled in.
+ *
+ * Unfortunately, in the meanwhile Slime started depending on this
+ * variable for deciding which communication style to use. So even
+ * though this variable looks unused, it shouldn't be deleted until
+ * it's no longer used in the versions of Slime that people are
+ * likely to download first. -- JES, 2006-06-07
+ */
+int linux_no_threads_p = 0;
+
 #ifdef LISP_FEATURE_SB_THREAD
 int
 isnptl (void)
@@ -119,7 +156,7 @@ os_init(char *argv[], char *envp[])
 {
     /* Conduct various version checks: do we have enough mmap(), is
      * this a sparc running 2.2, can we do threads? */
-#if defined(LISP_FEATURE_SB_THREAD) && !defined(LISP_FEATURE_SB_LUTEX)
+#if defined(LISP_FEATURE_SB_THREAD) && !defined(LISP_FEATURE_SB_LUTEX) && !defined(LISP_FEATURE_SB_PTHREAD_FUTEX)
     int *futex=0;
 #endif
     struct utsname name;
@@ -145,8 +182,8 @@ os_init(char *argv[], char *envp[])
 #endif
     }
 #ifdef LISP_FEATURE_SB_THREAD
-#if !defined(LISP_FEATURE_SB_LUTEX)
-    futex_wait(futex,-1);
+#if !defined(LISP_FEATURE_SB_LUTEX) && !defined(LISP_FEATURE_SB_PTHREAD_FUTEX)
+    futex_wait(futex,-1,-1,0);
     if(errno==ENOSYS) {
        lose("This version of SBCL is compiled with threading support, but your kernel\n"
             "is too old to support this. Please use a more recent kernel or\n"
@@ -159,7 +196,12 @@ os_init(char *argv[], char *envp[])
             "LD_ASSUME_KERNEL\n");
     }
 #endif
-    os_vm_page_size = getpagesize();
+
+    /* Don't use getpagesize(), since it's not constant across Linux
+     * kernel versions on some architectures (for example PPC). FIXME:
+     * possibly the same should be done on other architectures too.
+     */
+    os_vm_page_size = BACKEND_PAGE_BYTES;
 
     /* KLUDGE: Disable memory randomization on new Linux kernels
      * by setting a personality flag and re-executing. (We need
@@ -174,7 +216,9 @@ os_init(char *argv[], char *envp[])
          /* Some old kernels will apparently lose unsupported personality flags
           * on exec() */
          && ((minor_version == 6 && patch_version >= 11)
-             || (minor_version > 6)))
+             || (minor_version > 6)
+             /* This is what RHEL 3 reports */
+             || (minor_version == 4 && patch_version > 20)))
         || major_version >= 3)
     {
         int pers = personality(0xffffffffUL);
@@ -358,11 +402,11 @@ sigsegv_handler(int signal, siginfo_t *info, void* void_context)
 #ifdef LISP_FEATURE_GENCGC
     if (!gencgc_handle_wp_violation(addr))
 #else
-    if (!interrupt_maybe_gc(signal, info, context))
+    if (!cheneygc_handle_wp_violation(context, addr))
 #endif
         if (!handle_guard_page_triggered(context, addr))
 #ifdef LISP_FEATURE_C_STACK_IS_CONTROL_STACK
-            arrange_return_to_lisp_function(context, SymbolFunction(MEMORY_FAULT_ERROR));
+            lisp_memory_fault_error(context, addr);
 #else
             interrupt_handle_now(signal, info, context);
 #endif