static gpointer writeout_thread(gpointer opaque)
{
TraceRecord *recordptr;
union {
TraceRecord rec;
uint8_t bytes[sizeof(TraceRecord) + sizeof(uint64_t)];
} dropped;
unsigned int idx = 0;
int dropped_count;
size_t unused __attribute__ ((unused));
uint64_t type = TRACE_RECORD_TYPE_EVENT;
for (;;) {
wait_for_trace_records_available();
if (g_atomic_int_get(&dropped_events)) {
dropped.rec.event = DROPPED_EVENT_ID,
dropped.rec.timestamp_ns = get_clock();
dropped.rec.length = sizeof(TraceRecord) + sizeof(uint64_t),
dropped.rec.pid = trace_pid;
do {
dropped_count = g_atomic_int_get(&dropped_events);
} while (!g_atomic_int_compare_and_exchange(&dropped_events,
dropped_count, 0));
dropped.rec.arguments[0] = dropped_count;
unused = fwrite(&type, sizeof(type), 1, trace_fp);
unused = fwrite(&dropped.rec, dropped.rec.length, 1, trace_fp);
}
while (get_trace_record(idx, &recordptr)) {
unused = fwrite(&type, sizeof(type), 1, trace_fp);
unused = fwrite(recordptr, recordptr->length, 1, trace_fp);
writeout_idx += recordptr->length;
free(recordptr); /* don't use g_free, can deadlock when traced */
idx = writeout_idx % TRACE_BUF_LEN;
}
fflush(trace_fp);
}
return NULL;
}
static gpointer writeout_thread(gpointer opaque)
{
TraceRecord *recordptr;
union {
TraceRecord rec;
uint8_t bytes[sizeof(TraceRecord) + sizeof(uint64_t)];
} dropped;
unsigned int idx = 0;
uint64_t dropped_count;
size_t unused __attribute__ ((unused));
for (;;) {
wait_for_trace_records_available();
if (dropped_events) {
dropped.rec.event = DROPPED_EVENT_ID,
dropped.rec.timestamp_ns = get_clock();
dropped.rec.length = sizeof(TraceRecord) + sizeof(dropped_events),
dropped.rec.reserved = 0;
while (1) {
dropped_count = dropped_events;
if (g_atomic_int_compare_and_exchange((gint *)&dropped_events,
dropped_count, 0)) {
break;
}
}
memcpy(dropped.rec.arguments, &dropped_count, sizeof(uint64_t));
unused = fwrite(&dropped.rec, dropped.rec.length, 1, trace_fp);
}
while (get_trace_record(idx, &recordptr)) {
unused = fwrite(recordptr, recordptr->length, 1, trace_fp);
writeout_idx += recordptr->length;
free(recordptr); /* dont use g_free, can deadlock when traced */
idx = writeout_idx % TRACE_BUF_LEN;
}
fflush(trace_fp);
}
return NULL;
}