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-rw-r--r--erts/emulator/beam/erl_bif_info.c9
-rw-r--r--erts/emulator/beam/erl_lock_check.c111
-rw-r--r--erts/emulator/beam/erl_lock_check.h2
3 files changed, 120 insertions, 2 deletions
diff --git a/erts/emulator/beam/erl_bif_info.c b/erts/emulator/beam/erl_bif_info.c
index bdca93428e..874ac0f9e6 100644
--- a/erts/emulator/beam/erl_bif_info.c
+++ b/erts/emulator/beam/erl_bif_info.c
@@ -3928,6 +3928,15 @@ BIF_RETTYPE erts_debug_get_internal_state_1(BIF_ALIST_1)
BIF_RET(am_false);
#endif
}
+ else if (ERTS_IS_ATOM_STR("lc_graph", BIF_ARG_1)) {
+#ifdef ERTS_ENABLE_LOCK_CHECK
+ Eterm res = erts_lc_dump_graph();
+ BIF_RET(res);
+#else
+ BIF_RET(am_notsup);
+#endif
+ }
+
}
else if (is_tuple(BIF_ARG_1)) {
Eterm* tp = tuple_val(BIF_ARG_1);
diff --git a/erts/emulator/beam/erl_lock_check.c b/erts/emulator/beam/erl_lock_check.c
index 5d33de9e88..53edf6abc1 100644
--- a/erts/emulator/beam/erl_lock_check.c
+++ b/erts/emulator/beam/erl_lock_check.c
@@ -41,6 +41,7 @@
#include "erl_lock_check.h"
#include "erl_term.h"
#include "erl_threads.h"
+#include "erl_atom_table.h"
typedef struct {
char *name;
@@ -75,6 +76,7 @@ static erts_lc_lock_order_t erts_lock_order[] = {
* if only one lock use
* the lock name)"
*/
+ { "NO LOCK", NULL },
{ "driver_lock", "driver_name" },
{ "port_lock", "port_id" },
{ "port_data_lock", "address" },
@@ -196,6 +198,19 @@ typedef struct {
lc_locked_lock_t *last;
} lc_locked_lock_list_t;
+typedef struct {
+ /*
+ * m[X][Y] & 1 if we locked X directly after Y was locked.
+ * m[X][Y] & 2 if we locked X indirectly after Y was locked.
+ * m[X][0] = 1 if we locked X when nothing else was locked.
+ * m[0][] is unused as it would represent locking "NO LOCK"
+ */
+ char m[ERTS_LOCK_ORDER_SIZE][ERTS_LOCK_ORDER_SIZE];
+
+} lc_matrix_t;
+
+static lc_matrix_t tot_lc_matrix;
+
typedef struct lc_thread_t_ lc_thread_t;
struct lc_thread_t_ {
char *thread_name;
@@ -205,6 +220,7 @@ struct lc_thread_t_ {
lc_thread_t *prev;
lc_locked_lock_list_t locked;
lc_locked_lock_list_t required;
+ lc_matrix_t matrix;
};
typedef union lc_free_block_t_ lc_free_block_t;
@@ -322,6 +338,7 @@ create_thread_data(char *thread_name)
thr->locked.first = NULL;
thr->locked.last = NULL;
thr->prev = NULL;
+ sys_memzero(&thr->matrix, sizeof(thr->matrix));
lc_lock();
thr->next = lc_threads;
@@ -333,6 +350,8 @@ create_thread_data(char *thread_name)
return thr;
}
+static void collect_matrix(lc_matrix_t*);
+
static void
destroy_locked_locks(lc_thread_t *thr)
{
@@ -352,6 +371,9 @@ destroy_locked_locks(lc_thread_t *thr)
}
if (thr->next)
thr->next->prev = thr->prev;
+
+ collect_matrix(&thr->matrix);
+
lc_unlock();
free((void *) thr);
@@ -394,7 +416,7 @@ static void
raw_print_lock(char *prefix, Sint16 id, Wterm extra, erts_lock_flags_t flags,
char* file, unsigned int line, char *suffix)
{
- char *lname = (0 <= id && id < ERTS_LOCK_ORDER_SIZE
+ char *lname = (1 <= id && id < ERTS_LOCK_ORDER_SIZE
? erts_lock_order[id].name
: "unknown");
erts_fprintf(stderr,"%s'%s:",prefix,lname);
@@ -1144,12 +1166,25 @@ void erts_lc_lock_flg_x(erts_lc_lock_t *lck, erts_lock_options_t options,
if (!thr->locked.last) {
ASSERT(!thr->locked.first);
thr->locked.last = thr->locked.first = new_ll;
+ ASSERT(0 < lck->id && lck->id < ERTS_LOCK_ORDER_SIZE);
+ thr->matrix.m[lck->id][0] = 1;
}
else if (thr->locked.last->id < lck->id
|| (thr->locked.last->id == lck->id
&& thr->locked.last->extra < lck->extra)) {
- if (LOCK_IS_TYPE_ORDER_VIOLATION(lck->flags, thr->locked.last->flags))
+ lc_locked_lock_t* ll;
+ if (LOCK_IS_TYPE_ORDER_VIOLATION(lck->flags, thr->locked.last->flags)) {
type_order_violation("locking ", thr, lck);
+ }
+
+ ASSERT(0 < lck->id && lck->id < ERTS_LOCK_ORDER_SIZE);
+ ll = thr->locked.last;
+ thr->matrix.m[lck->id][ll->id] |= 1;
+ for (ll = ll->prev; ll; ll = ll->prev) {
+ ASSERT(0 < ll->id && ll->id < ERTS_LOCK_ORDER_SIZE);
+ thr->matrix.m[lck->id][ll->id] |= 2;
+ }
+
new_ll->prev = thr->locked.last;
thr->locked.last->next = new_ll;
thr->locked.last = new_ll;
@@ -1342,4 +1377,76 @@ erts_lc_pll(void)
print_curr_locks(get_my_locked_locks());
}
+static void collect_matrix(lc_matrix_t* matrix)
+{
+ int i, j;
+ for (i = 1; i < ERTS_LOCK_ORDER_SIZE; i++) {
+ for (j = 0; j <= i; j++) {
+ tot_lc_matrix.m[i][j] |= matrix->m[i][j];
+ }
+#ifdef DEBUG
+ for ( ; j < ERTS_LOCK_ORDER_SIZE; j++) {
+ ASSERT(matrix->m[i][j] == 0);
+ }
+#endif
+ }
+}
+
+Eterm
+erts_lc_dump_graph(void)
+{
+ const char* basename = "lc_graph.";
+ char filename[40];
+ lc_matrix_t* tot = &tot_lc_matrix;
+ lc_thread_t* thr;
+ int i, j, name_max = 0;
+ FILE* ff;
+
+ lc_lock();
+ for (thr = lc_threads; thr; thr = thr->next) {
+ collect_matrix(&thr->matrix);
+ }
+ lc_unlock();
+
+ sys_strcpy(filename, basename);
+ sys_get_pid(filename + strlen(basename),
+ sizeof(filename) - strlen(basename));
+ ff = fopen(filename, "w");
+ if (!ff)
+ return am_error;
+
+ for (i = 1; i < ERTS_LOCK_ORDER_SIZE; i++) {
+ int len = strlen(erts_lock_order[i].name);
+ if (name_max < len)
+ name_max = len;
+ }
+ fputs("%This file was generated by erts_debug:lc_graph()\n\n", ff);
+ fputs("%{ThisLockName, ThisLockId, LockedDirectlyBeforeThis, LockedIndirectlyBeforeThis}\n", ff);
+ fprintf(ff, "[{%*s, %2d}", name_max, "\"NO LOCK\"", 0);
+ for (i = 1; i < ERTS_LOCK_ORDER_SIZE; i++) {
+ char* delim = "";
+ fprintf(ff, ",\n {%*s, %2d, [", name_max, erts_lock_order[i].name, i);
+ for (j = 0; j < ERTS_LOCK_ORDER_SIZE; j++) {
+ if (tot->m[i][j] & 1) {
+ fprintf(ff, "%s%d", delim, j);
+ delim = ",";
+ }
+ }
+ fprintf(ff, "], [");
+ delim = "";
+ for (j = 0; j < ERTS_LOCK_ORDER_SIZE; j++) {
+ if (tot->m[i][j] == 2) {
+ fprintf(ff, "%s%d", delim, j);
+ delim = ",";
+ }
+ }
+ fputs("]}", ff);
+ }
+ fputs("].", ff);
+ fclose(ff);
+ erts_fprintf(stderr, "Created file '%s' in current working directory\n",
+ filename);
+ return am_ok;
+}
+
#endif /* #ifdef ERTS_ENABLE_LOCK_CHECK */
diff --git a/erts/emulator/beam/erl_lock_check.h b/erts/emulator/beam/erl_lock_check.h
index 5c2c38e8f2..138bc810bd 100644
--- a/erts/emulator/beam/erl_lock_check.h
+++ b/erts/emulator/beam/erl_lock_check.h
@@ -94,6 +94,8 @@ void erts_lc_unrequire_lock(erts_lc_lock_t *lck);
int erts_lc_is_emu_thr(void);
+Eterm erts_lc_dump_graph(void);
+
#define ERTS_LC_ASSERT(A) \
((void) (((A) || ERTS_SOMEONE_IS_CRASH_DUMPING) ? 1 : erts_lc_assert_failed(__FILE__, __LINE__, #A)))
#else /* #ifdef ERTS_ENABLE_LOCK_CHECK */
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-03 11:12:28 +0000