2 * Written by Josh Dybnis and released to the public domain, as explained at
3 * http://creativecommons.org/licenses/publicdomain
14 DECLARE_THREAD_LOCAL(tb_, int);
16 lwt_buffer_t *lwt_buf_[MAX_NUM_THREADS] = {};
17 uint64_t flag_mask_ = 0;
18 static int buf_count_ = 0;
19 static const char *flags_ = "";
23 INIT_THREAD_LOCAL(tb_, NULL);
26 void lwt_thread_init (int thread_id)
28 assert(thread_id < MAX_NUM_THREADS);
29 if (lwt_buf_[thread_id] == NULL) {
30 lwt_buf_[thread_id] = (lwt_buffer_t *)nbd_malloc(sizeof(lwt_buffer_t) + sizeof(lwt_record_t) * LWT_BUFFER_SIZE);
31 SYNC_ADD(&buf_count_, 1);
32 memset(lwt_buf_[thread_id], 0, sizeof(lwt_buffer_t));
33 SET_THREAD_LOCAL(tb_, lwt_buf_[thread_id]);
37 void lwt_set_trace_level (const char *flags)
39 assert(strlen(flags) % 2 == 0); // a well formed <flags> should be an even number of characters long
42 for (i = 0; flags[i]; i+=2) {
43 flag_mask_ |= 1 << (flags[i] - 'A');
47 static inline void dump_record (FILE *file, int thread_id, lwt_record_t *r, uint64_t offset)
49 // print the record if its trace category is enabled at a high enough level
50 int flag = (size_t)r->format >> 56;
51 int level = ((size_t)r->format >> 48) & 0xFF;
52 const char *f = strchr(flags_, flag);
53 if (f != NULL && level <= f[1]) {
54 char s[3] = {flag, level, '\0'};
55 fprintf(file, "%09llu %d %s ", ((uint64_t)r->timestamp - offset) >> 6, thread_id, s);
56 const char *format = (const char *)(((uint64_t)r->format << 16) >> 16); // strip out the embedded flags
57 fprintf(file, format, r->value1, r->value2);
62 static void dump_buffer (FILE *file, int thread_id, uint64_t offset)
64 assert(thread_id < buf_count_);
66 lwt_buffer_t *tb = lwt_buf_[thread_id];
68 if (tb->head > LWT_BUFFER_SIZE) {
69 for (i = tb->head & LWT_BUFFER_MASK; i < LWT_BUFFER_SIZE; ++i) {
70 dump_record(file, thread_id, tb->x + i, offset);
74 for (i = 0; i < (tb->head & LWT_BUFFER_MASK); ++i) {
75 dump_record(file, thread_id, tb->x + i, offset);
79 void lwt_dump (const char *file_name)
81 uint64_t offset = (uint64_t)-1;
84 for (i = 0; i < buf_count_; ++i) {
85 if (lwt_buf_[i] != NULL && lwt_buf_[i]->head != 0) {
86 uint64_t x = lwt_buf_[i]->x[0].timestamp;
90 if (lwt_buf_[i]->head > LWT_BUFFER_SIZE)
92 x = lwt_buf_[i]->x[lwt_buf_[i]->head & LWT_BUFFER_MASK].timestamp;
100 if (offset != (uint64_t)-1) {
101 FILE *file = fopen(file_name, "w");
103 for (i = 0; i < buf_count_; ++i) {
104 if (lwt_buf_[i] != NULL) {
105 dump_buffer(file, i, offset);