static __always_inline void
_maybe_init (void)
{
if (__builtin_expect (libgcc_s_handle == NULL, 0))
init ();
else
atomic_read_barrier ();
}
_Unwind_Word
_Unwind_GetCFA (struct _Unwind_Context *context)
{
if (__builtin_expect (libgcc_s_handle == NULL, 0))
pthread_cancel_init ();
else
atomic_read_barrier ();
_Unwind_Word (*getcfa) (struct _Unwind_Context *) = libgcc_s_getcfa;
PTR_DEMANGLE (getcfa);
return getcfa (context);
}
void
_Unwind_Resume (struct _Unwind_Exception *exc)
{
if (__builtin_expect (libgcc_s_handle == NULL, 0))
pthread_cancel_init ();
else
atomic_read_barrier ();
void (*resume) (struct _Unwind_Exception *exc) = libgcc_s_resume;
PTR_DEMANGLE (resume);
resume (exc);
}
void
_Unwind_Resume (struct _Unwind_Exception *exc)
{
if (__glibc_unlikely (libgcc_s_handle == NULL))
pthread_cancel_init ();
else
atomic_read_barrier ();
void (*resume) (struct _Unwind_Exception *exc) = __libgcc_s_resume;
PTR_DEMANGLE (resume);
resume (exc);
}
_Unwind_Reason_Code
_Unwind_ForcedUnwind (struct _Unwind_Exception *exc, _Unwind_Stop_Fn stop,
void *stop_argument)
{
if (__builtin_expect (libgcc_s_handle == NULL, 0))
pthread_cancel_init ();
else
atomic_read_barrier ();
_Unwind_Reason_Code (*forcedunwind)
(struct _Unwind_Exception *, _Unwind_Stop_Fn, void *)
= libgcc_s_forcedunwind;
PTR_DEMANGLE (forcedunwind);
return forcedunwind (exc, stop, stop_argument);
}
_Unwind_Reason_Code
__gcc_personality_v0 (int version, _Unwind_Action actions,
_Unwind_Exception_Class exception_class,
struct _Unwind_Exception *ue_header,
struct _Unwind_Context *context)
{
if (__builtin_expect (libgcc_s_handle == NULL, 0))
pthread_cancel_init ();
else
atomic_read_barrier ();
_Unwind_Reason_Code (*personality)
(int, _Unwind_Action, _Unwind_Exception_Class, struct _Unwind_Exception *,
struct _Unwind_Context *) = libgcc_s_personality;
PTR_DEMANGLE (personality);
return personality (version, actions, exception_class, ue_header, context);
}
int
__get_nprocs (void)
{
static int cached_result = -1;
static time_t timestamp;
time_t now = time (NULL);
time_t prev = timestamp;
atomic_read_barrier ();
if (now == prev && cached_result > -1)
return cached_result;
/* XXX Here will come a test for the new system call. */
const size_t buffer_size = __libc_use_alloca (8192) ? 8192 : 512;
char *buffer = alloca (buffer_size);
char *buffer_end = buffer + buffer_size;
char *cp = buffer_end;
char *re = buffer_end;
const int flags = O_RDONLY | O_CLOEXEC;
int fd = __open_nocancel ("/sys/devices/system/cpu/online", flags);
char *l;
int result = 0;
if (fd != -1)
{
l = next_line (fd, buffer, &cp, &re, buffer_end);
if (l != NULL)
do
{
char *endp;
unsigned long int n = strtoul (l, &endp, 10);
if (l == endp)
{
result = 0;
break;
}
unsigned long int m = n;
if (*endp == '-')
{
l = endp + 1;
m = strtoul (l, &endp, 10);
if (l == endp)
{
result = 0;
break;
}
}
result += m - n + 1;
l = endp;
while (l < re && isspace (*l))
++l;
}
while (l < re);
__close_nocancel_nostatus (fd);
if (result > 0)
goto out;
}
cp = buffer_end;
re = buffer_end;
/* Default to an SMP system in case we cannot obtain an accurate
number. */
result = 2;
/* The /proc/stat format is more uniform, use it by default. */
fd = __open_nocancel ("/proc/stat", flags);
if (fd != -1)
{
result = 0;
while ((l = next_line (fd, buffer, &cp, &re, buffer_end)) != NULL)
/* The current format of /proc/stat has all the cpu* entries
at the front. We assume here that stays this way. */
if (strncmp (l, "cpu", 3) != 0)
break;
else if (isdigit (l[3]))
++result;
__close_nocancel_nostatus (fd);
}
else
{
fd = __open_nocancel ("/proc/cpuinfo", flags);
if (fd != -1)
{
GET_NPROCS_PARSER (fd, buffer, cp, re, buffer_end, result);
__close_nocancel_nostatus (fd);
}
}
out:
cached_result = result;
atomic_write_barrier ();
timestamp = now;
return result;
}
void membar_consumer (void)
{
atomic_read_barrier ();
}
