X-Git-Url: http://repo.macrolet.net/gitweb/?a=blobdiff_plain;f=src%2Fruntime%2Fx86-linux-os.c;h=4b4f9ffb8a66997a9d714e84d836918971960a91;hb=5563d2712045491695f68c018dbdd1233faca4e5;hp=07b8e33998b469a2c3df0f1c7510a648413ca661;hpb=6b7b0266343826426a3efffa3b8b8d4d552f8f97;p=sbcl.git

diff --git a/src/runtime/x86-linux-os.c b/src/runtime/x86-linux-os.c
index 07b8e33..4b4f9ff 100644
--- a/src/runtime/x86-linux-os.c
+++ b/src/runtime/x86-linux-os.c
@@ -22,6 +22,7 @@
 #include <unistd.h>
 #include <errno.h>
 
+#include "sbcl.h"
 #include "./signal.h"
 #include "os.h"
 #include "arch.h"
@@ -29,7 +30,6 @@
 #include "interrupt.h"
 #include "interr.h"
 #include "lispregs.h"
-#include "sbcl.h"
 #include <sys/socket.h>
 #include <sys/utsname.h>
 
@@ -42,8 +42,13 @@
 #include <asm/ldt.h>
 #include <linux/unistd.h>
 #include <sys/mman.h>
+#include <linux/version.h>
 #include "thread.h"		/* dynamic_values_bytes */
 
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
+#define user_desc  modify_ldt_ldt_s 
+#endif
+
 _syscall3(int, modify_ldt, int, func, void *, ptr, unsigned long, bytecount );
 
 #include "validate.h"
@@ -51,9 +56,8 @@ size_t os_vm_page_size;
 
 u32 local_ldt_copy[LDT_ENTRIES*LDT_ENTRY_SIZE/sizeof(u32)];
 
-/* XXX this could be conditionally compiled based on some
- * "debug-friendly" flag.  But it doesn't really make stuff slower,
- * just the runtime gets fractionally larger */
+/* This is never actually called, but it's great for calling from gdb when
+ * users have thread-related problems that maintainers can't duplicate */
 
 void debug_get_ldt()
 { 
@@ -61,20 +65,20 @@ void debug_get_ldt()
     printf("%d bytes in ldt: print/x local_ldt_copy\n", n);
 }
 
-lispobj modify_ldt_lock;	/* protect all calls to modify_ldt */
+volatile lispobj modify_ldt_lock;	/* protect all calls to modify_ldt */
 
 int arch_os_thread_init(struct thread *thread) {
     stack_t sigstack;
 #ifdef LISP_FEATURE_SB_THREAD
-    /* this must be called from a function that has an exclusive lock
-     * on all_threads
+    /* FIXME Lock ordering rules: all_threads_lock must usually be
+     * held when getting modify_ldt_lock
      */
-    struct modify_ldt_ldt_s ldt_entry = {
+    struct user_desc ldt_entry = {
 	1, 0, 0, /* index, address, length filled in later */
 	1, MODIFY_LDT_CONTENTS_DATA, 0, 0, 0, 1
     }; 
     int n;
-    get_spinlock(&modify_ldt_lock,thread);
+    get_spinlock(&modify_ldt_lock,(long)thread);
     n=modify_ldt(0,local_ldt_copy,sizeof local_ldt_copy);
     /* get next free ldt entry */
 
@@ -100,6 +104,7 @@ int arch_os_thread_init(struct thread *thread) {
     modify_ldt_lock=0;
 
     if(n<0) return 0;
+    pthread_setspecific(specials,thread);
 #endif
 #ifdef LISP_FEATURE_C_STACK_IS_CONTROL_STACK
     /* Signal handlers are run on the control stack, so if it is exhausted
@@ -109,25 +114,13 @@ int arch_os_thread_init(struct thread *thread) {
     sigstack.ss_flags=0;
     sigstack.ss_size = 32*SIGSTKSZ;
     sigaltstack(&sigstack,0);
+    if(sigaltstack(&sigstack,0)<0) {
+        lose("Cannot sigaltstack: %s\n",strerror(errno));
+    }
 #endif
     return 1;
 }
 
-/* if you can't do something like this (maybe because you're using a 
- * register for thread base that is only available in Lisp code)
- * you'll just have to find_thread_by_pid(getpid())
- */
-struct thread *arch_os_get_current_thread() {
-#ifdef LISP_FEATURE_SB_THREAD
-    register struct thread *me=0;
-    if(all_threads)
-	__asm__ __volatile__ ("movl %%fs:%c1,%0" : "=r" (me)
-		 : "i" (offsetof (struct thread,this)));
-    return me;
-#else
-    return all_threads;
-#endif
-}
 struct thread *debug_get_fs() {
     register u32 fs;
     __asm__ __volatile__ ("movl %%fs,%0" : "=r" (fs)  : );
@@ -139,13 +132,13 @@ struct thread *debug_get_fs() {
  */
 
 int arch_os_thread_cleanup(struct thread *thread) {
-    struct modify_ldt_ldt_s ldt_entry = {
+    struct user_desc ldt_entry = {
 	0, 0, 0, 
 	0, MODIFY_LDT_CONTENTS_DATA, 0, 0, 0, 0
     }; 
 
     ldt_entry.entry_number=thread->tls_cookie;
-    get_spinlock(&modify_ldt_lock,thread);
+    get_spinlock(&modify_ldt_lock,(long)thread);
     if (modify_ldt (1, &ldt_entry, sizeof (ldt_entry)) != 0) {
 	modify_ldt_lock=0;
 	/* modify_ldt call failed: something magical is not happening */