#include <stdio.h>
#include <sys/param.h>
#include <sys/file.h>
+#include "sbcl.h"
#include "./signal.h"
#include "os.h"
#include "arch.h"
#include "globals.h"
+#include "sbcl.h"
#include "interrupt.h"
#include "interr.h"
#include "lispregs.h"
-#include "sbcl.h"
#include <sys/socket.h>
#include <sys/utsname.h>
#include "thread.h"
size_t os_vm_page_size;
+#ifdef LISP_FEATURE_SB_FUTEX
+#include <linux/unistd.h>
+#include <errno.h>
+
+/* values taken from the kernel's linux/futex.h. This header file
+ doesn't exist in userspace, which is our excuse for not grovelling
+ them automatically */
+#define FUTEX_WAIT (0)
+#define FUTEX_WAKE (1)
+#define FUTEX_FD (2)
+#define FUTEX_REQUEUE (3)
+
+#define __NR_sys_futex __NR_futex
+
+_syscall4(int,sys_futex,
+ int *, futex,
+ int, op,
+ int, val,
+ struct timespec *, rel);
+#endif
+
#include "gc.h"
\f
int linux_sparc_siginfo_bug = 0;
+int linux_supports_futex=0;
void os_init(void)
{
/* Conduct various version checks: do we have enough mmap(), is
* this a sparc running 2.2, can we do threads? */
- {
- struct utsname name;
- int major_version;
- int minor_version;
- char *p;
- uname(&name);
- p=name.release;
- major_version = atoi(p);
- p=strchr(p,'.')+1;
- minor_version = atoi(p);
- if (major_version<2) {
- lose("linux kernel version too old: major version=%d (can't run in version < 2.0.0)",
- major_version);
- }
+ int *futex=0;
+ struct utsname name;
+ int major_version;
+ int minor_version;
+ char *p;
+ uname(&name);
+ p=name.release;
+ major_version = atoi(p);
+ p=strchr(p,'.')+1;
+ minor_version = atoi(p);
+ if (major_version<2) {
+ lose("linux kernel version too old: major version=%d (can't run in version < 2.0.0)",
+ major_version);
+ }
+ if (!(major_version>2 || minor_version >= 4)) {
#ifdef LISP_FEATURE_SB_THREAD
- if ((major_version <2) || (major_version==2 && minor_version < 4)) {
- lose("linux kernel 2.4 required for thread-enabled SBCL");
- }
+ lose("linux kernel 2.4 required for thread-enabled SBCL");
#endif
#ifdef LISP_FEATURE_SPARC
- if ((major_version <2) || (major_version==2 && minor_version < 4)) {
- FSHOW((stderr,"linux kernel %d.%d predates 2.4;\n enabling workarounds for SPARC kernel bugs in signal handling.\n", minor_version));
- linux_sparc_siginfo_bug = 1;
- }
+ FSHOW((stderr,"linux kernel %d.%d predates 2.4;\n enabling workarounds for SPARC kernel bugs in signal handling.\n", major_version,minor_version));
+ linux_sparc_siginfo_bug = 1;
#endif
}
-
- os_vm_page_size = getpagesize();
- /* This could just as well be in arch_init(), but it's not. */
-#ifdef __i386__
- /* FIXME: This used to be here. However, I have just removed it
- with no apparent ill effects (it may be that earlier kernels
- started up a process with a different set of traps, or
- something?) Find out what this was meant to do, and reenable it
- or delete it if possible. -- CSR, 2002-07-15 */
- /* SET_FPU_CONTROL_WORD(0x1372|4|8|16|32); no interrupts */
+#ifdef LISP_FEATURE_SB_FUTEX
+ futex_wait(futex,-1);
+ if(errno!=ENOSYS) linux_supports_futex=1;
#endif
+ os_vm_page_size = getpagesize();
}
sigsegv_handler(int signal, siginfo_t *info, void* void_context)
{
os_context_t *context = arch_os_get_context(&void_context);
- void* fault_addr = (void*)context->uc_mcontext.cr2;
+ void* fault_addr = (void*)info->si_addr;
if (!gencgc_handle_wp_violation(fault_addr))
if(!handle_control_stack_guard_triggered(context,fault_addr))
interrupt_handle_now(signal, info, void_context);
void sigcont_handler(int signal, siginfo_t *info, void *void_context)
{
- /* we need to have a handler installed for this signal so that
- * sigwaitinfo() for it actually returns at the appropriate time
- */
+ /* We need to have a handler installed for this signal so that
+ * sigwaitinfo() for it actually returns at the appropriate time.
+ * We don't need it to actually do anything. This mkes it
+ * possibly the only signal handler in SBCL that doesn't depend on
+ * not-guaranteed-by-POSIX features
+ */
}
void
{
undoably_install_low_level_interrupt_handler(SIG_MEMORY_FAULT,
sigsegv_handler);
- undoably_install_low_level_interrupt_handler(SIGCONT,
- sigcont_handler);
+#ifdef LISP_FEATURE_SB_THREAD
+ undoably_install_low_level_interrupt_handler(SIG_INTERRUPT_THREAD,
+ interrupt_thread_handler);
+ undoably_install_low_level_interrupt_handler(SIG_STOP_FOR_GC,
+ sig_stop_for_gc_handler);
+ undoably_install_low_level_interrupt_handler(SIG_THREAD_EXIT,
+ thread_exit_handler);
+ if(!linux_supports_futex)
+ undoably_install_low_level_interrupt_handler(SIG_DEQUEUE,
+ sigcont_handler);
+#endif
}
+#ifdef LISP_FEATURE_SB_FUTEX
+int futex_wait(int *lock_word, int oldval) {
+ int t= sys_futex(lock_word,FUTEX_WAIT,oldval, 0);
+ return t;
+}
+int futex_wake(int *lock_word, int n){
+ return sys_futex(lock_word,FUTEX_WAKE,n,0);
+}
+#endif