#include "gc.h"
#if defined LISP_FEATURE_GENCGC
#include "gencgc-internal.h"
+#else
+#include "cheneygc-internal.h"
+#endif
+#include <fcntl.h>
+#ifdef LISP_FEATURE_SB_WTIMER
+# include <sys/timerfd.h>
#endif
#ifdef LISP_FEATURE_X86
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_FUTEX) && !defined(LISP_FEATURE_SB_PTHREAD_FUTEX)
#include <sys/syscall.h>
#include <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_WAIT 0
+#define FUTEX_WAKE 1
+/* This is also copied from linux/futex.h so that a binary compiled on
+ * a not so recent Linux system can still take advantage of private
+ * futexes when available.*/
+#define FUTEX_WAIT_PRIVATE (0+128)
+#define FUTEX_WAKE_PRIVATE (1+128)
#define FUTEX_FD (2)
#define FUTEX_REQUEUE (3)
+/* Not static so that Lisp may query it. */
+boolean futex_private_supported_p;
+
+static inline int
+futex_wait_op()
+{
+ return (futex_private_supported_p ? FUTEX_WAIT_PRIVATE : FUTEX_WAIT);
+}
+
+static inline int
+futex_wake_op()
+{
+ return (futex_private_supported_p ? FUTEX_WAKE_PRIVATE : FUTEX_WAKE);
+}
+
#define sys_futex sbcl_sys_futex
static inline int sys_futex (void *futex, int op, int val, struct timespec *rel)
{
return syscall (SYS_futex, futex, op, val, rel);
}
+static void
+futex_init()
+{
+ int x = 0;
+ sys_futex(&x, FUTEX_WAIT, 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"
+ "a version of SBCL without threading support.\n");
+ sys_futex(&x, FUTEX_WAIT_PRIVATE, 1, 0);
+ if (errno == EWOULDBLOCK) {
+ futex_private_supported_p = 1;
+ } else {
+ futex_private_supported_p = 0;
+ SHOW("No futex private suppport\n");
+ }
+}
+
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;
+
+ if (sec<0) {
+ t = sys_futex(lock_word, futex_wait_op(), oldval, 0);
+ }
+ else {
+ timeout.tv_sec = sec;
+ timeout.tv_nsec = usec * 1000;
+ t = sys_futex(lock_word, futex_wait_op(), oldval, &timeout);
+ }
+ if (t==0)
+ return 0;
+ else if (errno==ETIMEDOUT)
+ return 1;
+ else if (errno==EINTR)
+ return 2;
+ else
+ /* EWOULDBLOCK and others, need to check the lock */
+ return -1;
}
int
futex_wake(int *lock_word, int n)
{
- return sys_futex(lock_word,FUTEX_WAKE,n,0);
+ return sys_futex(lock_word, futex_wake_op(),n,0);
}
#endif
{
/* 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)
- int *futex=0;
-#endif
struct utsname name;
int major_version;
int minor_version;
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);
#endif
}
#ifdef LISP_FEATURE_SB_THREAD
-#if !defined(LISP_FEATURE_SB_LUTEX)
- futex_wait(futex,-1);
- 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"
- "a version of SBCL without threading support.\n");
- }
+#if defined(LISP_FEATURE_SB_FUTEX) && !defined(LISP_FEATURE_SB_PTHREAD_FUTEX)
+ futex_init();
#endif
if(! isnptl()) {
lose("This version of SBCL only works correctly with the NPTL threading\n"
"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
* Since randomization is currently implemented only on x86 kernels,
* don't do this trick on other platforms.
*/
-#ifdef LISP_FEATURE_X86
+#if defined(LISP_FEATURE_X86) || defined(LISP_FEATURE_X86_64)
if ((major_version == 2
/* 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);
* 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
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
/* Use SSE detector. Recent versions of Linux enable SSE support
* on SSE capable CPUs. */
/* FIXME: Are there any old versions that does not support SSE? */
fast_bzero_pointer = fast_bzero_detect;
#endif
+#endif
}
lose("An mprotect call failed with ENOMEM. This probably means that the maximum amount\n"
"of separate memory mappings was exceeded. To fix the problem, either increase\n"
"the maximum with e.g. 'echo 262144 > /proc/sys/vm/max_map_count' or recompile\n"
- "SBCL with a larger value for GENCGC-PAGE-SIZE in 'src/target/parms.lisp'.");
+ "SBCL with a larger value for GENCGC-CARD-BYTES in\n"
+ "'src/compiler/target/backend-parms.lisp'.");
} else {
perror("mprotect");
}
* page fault on this OS.
*/
static void
-sigsegv_handler(int signal, siginfo_t *info, void* void_context)
+sigsegv_handler(int signal, siginfo_t *info, os_context_t *context)
{
- os_context_t *context = arch_os_get_context(&void_context);
os_vm_address_t addr = arch_get_bad_addr(signal, info, context);
#ifdef LISP_FEATURE_ALPHA
}
#endif
+#ifdef LISP_FEATURE_SB_SAFEPOINT
+ if (!handle_safepoint_violation(context, addr))
+#endif
+
#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));
-#else
- interrupt_handle_now(signal, info, context);
-#endif
+ lisp_memory_fault_error(context, addr);
}
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
- undoably_install_low_level_interrupt_handler(SIG_INTERRUPT_THREAD,
- interrupt_thread_handler);
+# 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
}
char *
-os_get_runtime_executable_path()
+os_get_runtime_executable_path(int external)
{
char path[PATH_MAX + 1];
int size;
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
projects / sbcl.git / blobdiff