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signal-handling.c
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signal-handling.c
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// This file is a part of Julia. License is MIT: http:https://julialang.org/license
#include <stdlib.h>
#include <stddef.h>
#include <stdio.h>
#include "julia.h"
#include "julia_internal.h"
#ifdef __cplusplus
extern "C" {
#endif
#include <threading.h>
// Profiler control variables //
static volatile intptr_t *bt_data_prof = NULL;
static volatile size_t bt_size_max = 0;
static volatile size_t bt_size_cur = 0;
static volatile uint64_t nsecprof = 0;
static volatile int running = 0;
static const uint64_t GIGA = 1000000000ULL;
// Timers to take samples at intervals
JL_DLLEXPORT void jl_profile_stop_timer(void);
JL_DLLEXPORT int jl_profile_start_timer(void);
static uint64_t jl_last_sigint_trigger = 0;
static uint64_t jl_disable_sigint_time = 0;
static void jl_clear_force_sigint(void)
{
jl_last_sigint_trigger = 0;
}
static int jl_check_force_sigint(void)
{
static double accum_weight = 0;
uint64_t cur_time = uv_hrtime();
uint64_t dt = cur_time - jl_last_sigint_trigger;
uint64_t last_t = jl_last_sigint_trigger;
jl_last_sigint_trigger = cur_time;
if (last_t == 0) {
accum_weight = 0;
return 0;
}
double new_weight = accum_weight * exp(-(dt / 1e9)) + 0.3;
if (!isnormal(new_weight))
new_weight = 0;
accum_weight = new_weight;
if (new_weight > 1) {
jl_disable_sigint_time = cur_time + (uint64_t)0.5e9;
return 1;
}
jl_disable_sigint_time = 0;
return 0;
}
#ifndef _OS_WINDOWS_
// Not thread local, should only be accessed by the signal handler thread.
static volatile int jl_sigint_passed = 0;
static sigset_t jl_sigint_sset;
#endif
static int jl_ignore_sigint(void)
{
// On Unix, we get the SIGINT before the debugger which makes it very
// hard to interrupt a running process in the debugger with `Ctrl-C`.
// Manually raise a `SIGINT` on current thread with the signal temporarily
// unblocked and use it's behavior to decide if we need to handle the signal.
#ifndef _OS_WINDOWS_
jl_sigint_passed = 0;
pthread_sigmask(SIG_UNBLOCK, &jl_sigint_sset, NULL);
// This can swallow an external `SIGINT` but it's not an issue
// since we don't deliver the same number of signals anyway.
pthread_kill(pthread_self(), SIGINT);
pthread_sigmask(SIG_BLOCK, &jl_sigint_sset, NULL);
if (!jl_sigint_passed)
return 1;
#endif
// Force sigint requires pressing `Ctrl-C` repeatedly.
// Ignore sigint for a short time after that to avoid rethrowing sigint too
// quickly again. (Code that has this issue is inherently racy but this is
// an interactive feature anyway.)
return jl_disable_sigint_time && jl_disable_sigint_time > uv_hrtime();
}
static int exit_on_sigint = 0;
JL_DLLEXPORT void jl_exit_on_sigint(int on)
{
exit_on_sigint = on;
}
#if defined(_WIN32)
#include "signals-win.c"
#else
#include "signals-unix.c"
#endif
// what to do on a critical error
void jl_critical_error(int sig, bt_context_t *context, uintptr_t *bt_data, size_t *bt_size)
{
// This function is not allowed to reference any TLS variables.
// We need to explicitly pass in the TLS buffer pointer when
// we make `jl_filename` and `jl_lineno` thread local.
size_t i, n = *bt_size;
if (sig)
jl_safe_printf("\nsignal (%d): %s\n", sig, strsignal(sig));
jl_safe_printf("while loading %s, in expression starting on line %d\n", jl_filename, jl_lineno);
if (context)
*bt_size = n = rec_backtrace_ctx(bt_data, JL_MAX_BT_SIZE, context);
for (i = 0; i < n; i++)
jl_gdblookup(bt_data[i] - 1);
gc_debug_print_status();
gc_debug_critical_error();
}
///////////////////////
// Utility functions //
///////////////////////
JL_DLLEXPORT int jl_profile_init(size_t maxsize, uint64_t delay_nsec)
{
bt_size_max = maxsize;
nsecprof = delay_nsec;
if (bt_data_prof != NULL)
free((void*)bt_data_prof);
bt_data_prof = (intptr_t*) calloc(maxsize, sizeof(intptr_t));
if (bt_data_prof == NULL && maxsize > 0)
return -1;
bt_size_cur = 0;
return 0;
}
JL_DLLEXPORT uint8_t *jl_profile_get_data(void)
{
return (uint8_t*) bt_data_prof;
}
JL_DLLEXPORT size_t jl_profile_len_data(void)
{
return bt_size_cur;
}
JL_DLLEXPORT size_t jl_profile_maxlen_data(void)
{
return bt_size_max;
}
JL_DLLEXPORT uint64_t jl_profile_delay_nsec(void)
{
return nsecprof;
}
JL_DLLEXPORT void jl_profile_clear_data(void)
{
bt_size_cur = 0;
}
JL_DLLEXPORT int jl_profile_is_running(void)
{
return running;
}
#ifdef __cplusplus
}
#endif