1.0.3.4: make-target-2.lisp split into compile and dump phases.

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

diff --git a/src/runtime/linux-os.c b/src/runtime/linux-os.c
index faf1a47..6724eb1 100644 (file)
--- a/src/runtime/linux-os.c
+++ b/src/runtime/linux-os.c
@@ -62,7 +62,7 @@ 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>
@@ -84,7 +84,18 @@ static inline int sys_futex (void *futex, int op, int val, struct timespec *rel)
 int
 futex_wait(int *lock_word, int oldval)
 {
-    int t= sys_futex(lock_word,FUTEX_WAIT,oldval, 0);
+    int t;
+  again:
+    t = sys_futex(lock_word,FUTEX_WAIT,oldval, 0);
+
+    /* Interrupted FUTEX_WAIT calls may return early.
+     *
+     * If someone manages to wake the futex while we're spinning
+     * around it, we will just return with -1 and errno EWOULDBLOCK,
+     * because the value has changed, so that's ok. */
+    if (t != 0 && errno == EINTR)
+        goto again;
+
     return t;
 }
 
@@ -98,6 +109,21 @@ futex_wake(int *lock_word, int n)
 \f
 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 +145,7 @@ 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;
@@ -145,7 +171,7 @@ os_init(char *argv[], char *envp[])
 #endif
     }
 #ifdef LISP_FEATURE_SB_THREAD
-#if !defined(LISP_FEATURE_SB_LUTEX)
+#if !defined(LISP_FEATURE_SB_LUTEX) && !defined(LISP_FEATURE_SB_PTHREAD_FUTEX)
     futex_wait(futex,-1);
     if(errno==ENOSYS) {
        lose("This version of SBCL is compiled with threading support, but your kernel\n"
@@ -159,7 +185,12 @@ 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_SIZE;
 
     /* KLUDGE: Disable memory randomization on new Linux kernels
      * by setting a personality flag and re-executing. (We need
@@ -362,7 +393,7 @@ sigsegv_handler(int signal, siginfo_t *info, void* void_context)
 #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