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Make traces work with multiple threads, I think.

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git-svn-id: https://www.unprompted.com/svn/projects/tildefriends/trunk@4184 ed5197a5-7fde-0310-b194-c3ffbd925b24
This commit is contained in:
Cory McWilliams 2023-02-18 00:51:22 +00:00
parent 4bea8bb6ba
commit 1f67343d75
3 changed files with 138 additions and 34 deletions
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2
core/client.js
View File

@ -137,7 +137,7 @@ function showFiles() {
}
function trace() {
window.open(`/speedscope/#profileURL=${encodeURIComponent('/trace')}&title=Tilde%20Friends`);
window.open(`/speedscope/#profileURL=${encodeURIComponent('/trace')}`);
}
function stats() {

1
src/ssb.c
View File

@ -2149,6 +2149,7 @@ sqlite3* tf_ssb_acquire_db_reader(tf_ssb_t* ssb)
{
sqlite3_open_v2(ssb->db_path, &db, SQLITE_OPEN_READONLY, NULL);
tf_ssb_db_init_reader(db);
tf_trace_sqlite(ssb->trace, db);
}
uv_mutex_unlock(&ssb->db_readers_lock);
return db;

169
src/trace.c
View File

@ -1,3 +1,7 @@
#define _GNU_SOURCE
#include <pthread.h>
#undef _GNU_SOURCE
#include "trace.h"
#include "mem.h"
@ -9,7 +13,9 @@
#include <time.h>
#include <unistd.h>
#include <pthread.h>
#include <sqlite3.h>
#include <uv.h>
#if !defined(_countof)
#define _countof(a) ((int)(sizeof((a)) / sizeof(*(a))))
@ -29,20 +35,31 @@ typedef struct _tf_trace_stack_t
tf_trace_stack_t* next;
} tf_trace_stack_t;
typedef struct _tf_trace_thread_t
{
pthread_t id;
tf_trace_stack_t* stack;
char name[64];
} tf_trace_thread_t;
typedef struct _tf_trace_t
{
char buffer[k_buffer_size];
char process_name[256];
int write_offset;
uv_mutex_t mutex;
tf_trace_write_callback_t* callback;
void* user_data;
tf_trace_stack_t* stack;
uv_rwlock_t threads_lock;
tf_trace_thread_t** threads;
int threads_count;
} tf_trace_t;
static void _trace_append(tf_trace_t* trace, const char* buffer, size_t size, void* user_data)
{
uv_mutex_lock(&trace->mutex);
if (trace->write_offset + size + 2 >= k_buffer_size)
{
trace->buffer[trace->write_offset] = '\0';
@ -55,6 +72,7 @@ static void _trace_append(tf_trace_t* trace, const char* buffer, size_t size, vo
trace->write_offset += size;
trace->buffer[trace->write_offset++] = '\n';
}
uv_mutex_unlock(&trace->mutex);
}
tf_trace_t* tf_trace_create()
@ -62,17 +80,27 @@ tf_trace_t* tf_trace_create()
tf_trace_t* trace = tf_malloc(sizeof(tf_trace_t));
memset(trace, 0, sizeof(*trace));
trace->callback = _trace_append;
uv_mutex_init(&trace->mutex);
uv_rwlock_init(&trace->threads_lock);
return trace;
}
void tf_trace_destroy(tf_trace_t* trace)
{
while (trace->stack)
for (int i = 0; i < trace->threads_count; i++)
{
tf_trace_stack_t* stack = trace->stack;
trace->stack = stack->next;
tf_free(stack);
tf_trace_thread_t* thread = trace->threads[i];
while (thread->stack)
{
tf_trace_stack_t* stack = thread->stack;
thread->stack = stack->next;
tf_free(stack);
}
tf_free(thread);
}
tf_free(trace->threads);
uv_rwlock_destroy(&trace->threads_lock);
uv_mutex_destroy(&trace->mutex);
tf_free(trace);
}
@ -152,6 +180,88 @@ static int _tf_trace_escape_name(char* out, size_t out_size, const char* name)
return p;
}
static tf_trace_thread_t* _tf_trace_get_thread(tf_trace_t* trace, pthread_t self)
{
tf_trace_thread_t* found = NULL;
uv_rwlock_rdlock(&trace->threads_lock);
for (int i = 0; i < trace->threads_count; i++)
{
if (trace->threads[i]->id == self)
{
found = trace->threads[i];
break;
}
}
uv_rwlock_rdunlock(&trace->threads_lock);
if (!found)
{
uv_rwlock_wrlock(&trace->threads_lock);
/* Maybe it was added while we changed from rd to rw. */
for (int i = 0; i < trace->threads_count; i++)
{
if (trace->threads[i]->id == self)
{
found = trace->threads[i];
break;
}
}
if (!found)
{
found = tf_malloc(sizeof(tf_trace_thread_t));
*found = (tf_trace_thread_t)
{
.id = self,
};
#if defined(__linux__)
pthread_getname_np(self, found->name, sizeof(found->name));
#endif
trace->threads = tf_resize_vec(trace->threads, sizeof(tf_trace_thread_t*) * (trace->threads_count + 1));
trace->threads[trace->threads_count++] = found;
}
uv_rwlock_wrunlock(&trace->threads_lock);
}
return found;
}
static void _tf_push_stack(tf_trace_t* trace, pthread_t self, const char* name)
{
tf_trace_thread_t* thread = _tf_trace_get_thread(trace, self);
if (!thread->stack || thread->stack->count + 1 > (int)_countof(thread->stack->names))
{
tf_trace_stack_t* stack = tf_malloc(sizeof(tf_trace_stack_t));
memset(stack, 0, sizeof(*stack));
stack->next = thread->stack;
thread->stack = stack;
}
tf_trace_stack_t* stack = thread->stack;
while (stack->count == 0 && stack->next && stack->next->count + 1 <= (int)_countof(thread->stack->names))
{
stack = stack->next;
}
stack->names[stack->count++] = name;
}
static const char* _tf_pop_stack(tf_trace_t* trace, pthread_t self)
{
tf_trace_thread_t* thread = _tf_trace_get_thread(trace, self);
tf_trace_stack_t* stack = thread->stack;
while (stack && stack->count == 0)
{
stack = stack->next;
}
const char* name = NULL;
if (stack && stack->count > 0)
{
name = stack->names[stack->count - 1];
stack->count--;
}
return name;
}
void tf_trace_begin(tf_trace_t* trace, const char* name)
{
if (!trace)
@ -159,22 +269,11 @@ void tf_trace_begin(tf_trace_t* trace, const char* name)
return;
}
if (!trace->stack || trace->stack->count + 1 > _countof(trace->stack->names))
{
tf_trace_stack_t* stack = tf_malloc(sizeof(tf_trace_stack_t));
memset(stack, 0, sizeof(*stack));
stack->next = trace->stack;
trace->stack = stack;
}
tf_trace_stack_t* stack = trace->stack;
while (stack->count == 0 && stack->next && stack->next->count + 1 <= _countof(trace->stack->names))
{
stack = stack->next;
}
stack->names[stack->count++] = name;
pthread_t self = pthread_self();
_tf_push_stack(trace, self, name);
char line[1024];
int p = snprintf(line, sizeof(line), "{\"ph\": \"B\", \"pid\": %d, \"tid\": %" PRId64 ", \"ts\": %" PRId64 ", \"name\": \"", getpid(), (int64_t)pthread_self(), _trace_ts());
int p = snprintf(line, sizeof(line), "{\"ph\": \"B\", \"pid\": %d, \"tid\": \"0x%" PRIx64 "\", \"ts\": %" PRId64 ", \"name\": \"", getpid(), (int64_t)self, _trace_ts());
p += _tf_trace_escape_name(line + p, sizeof(line) - p, name);
p += snprintf(line + p, sizeof(line) - p, "\"},");
trace->callback(trace, line, p, trace->user_data);
@ -187,24 +286,15 @@ void tf_trace_end(tf_trace_t* trace)
return;
}
tf_trace_stack_t* stack = trace->stack;
while (stack && stack->count == 0)
{
stack = stack->next;
}
const char* name = NULL;
if (stack && stack->count > 0)
{
name = stack->names[stack->count - 1];
stack->count--;
}
pthread_t self = pthread_self();
const char* name = _tf_pop_stack(trace, self);
if (!name)
{
return;
}
char line[1024];
int p = snprintf(line, sizeof(line), "{\"ph\": \"E\", \"pid\": %d, \"tid\": %" PRId64 ", \"ts\": %" PRId64 ", \"name\": \"", getpid(), (int64_t)pthread_self(), _trace_ts());
int p = snprintf(line, sizeof(line), "{\"ph\": \"E\", \"pid\": %d, \"tid\": \"0x%" PRIx64 "\", \"ts\": %" PRId64 ", \"name\": \"", getpid(), (int64_t)pthread_self(), _trace_ts());
p += _tf_trace_escape_name(line + p, sizeof(line) - p, name);
p += snprintf(line + p, sizeof(line) - p, "\"},");
trace->callback(trace, line, p, trace->user_data);
@ -219,6 +309,7 @@ char* tf_trace_export(tf_trace_t* trace)
static const int k_extra_size = 1024;
char* buffer = tf_malloc(k_buffer_size + k_extra_size);
uv_mutex_lock(&trace->mutex);
const char* newline = strchr(trace->buffer + trace->write_offset, '\n');
int begin = newline ? newline - trace->buffer : 0;
size_t size = 0;
@ -226,10 +317,21 @@ char* tf_trace_export(tf_trace_t* trace)
if (*trace->process_name)
{
size += snprintf(buffer + size, k_buffer_size - size,
"{\"name\":\"process_name\",\"ph\":\"M\",\"pid\":%d,\"args\":{\"name\":\"%s\"}},",
"{\"ph\":\"M\",\"pid\":%d,\"name\":\"process_name\",\"args\":{\"name\":\"%s\"}},\n",
getpid(),
trace->process_name);
}
uv_rwlock_rdlock(&trace->threads_lock);
for (int i = 0; i < trace->threads_count; i++)
{
tf_trace_thread_t* thread = trace->threads[i];
size += snprintf(buffer + size, k_buffer_size - size,
"{\"ph\":\"M\",\"pid\":%d,\"tid\":\"0x%" PRIx64 "\",\"name\":\"thread_name\",\"args\":{\"name\":\"%s\"}},\n",
getpid(),
thread->id,
thread->name);
}
uv_rwlock_rdunlock(&trace->threads_lock);
if (begin)
{
size_t this_size = strlen(trace->buffer + begin);
@ -238,14 +340,15 @@ char* tf_trace_export(tf_trace_t* trace)
}
memcpy(buffer + size, trace->buffer, trace->write_offset);
size += trace->write_offset;
uv_mutex_unlock(&trace->mutex);
if (size > 2 && buffer[size - 1] == '\n' && buffer[size - 2] == ',')
{
buffer[size - 2] = '\n';
size--;
}
size += snprintf(buffer + size, k_buffer_size - size, "]}\n");
buffer[size] = '\0';
assert(size < (size_t)k_buffer_size + k_extra_size);
buffer[size] = '\0';
return buffer;
}