trace2/tr2_tls.h

   1 #ifndef TR2_TLS_H
   2 #define TR2_TLS_H
   3
   4 #include "strbuf.h"
   5
   6 /*
   7  * Arbitry limit for thread names for column alignment.
   8  */
   9 #define TR2_MAX_THREAD_NAME (24)
  10
  11 struct tr2tls_thread_ctx {
  12         struct strbuf thread_name;
  13         uint64_t *array_us_start;
  14         int alloc;
  15         int nr_open_regions; /* plays role of "nr" in ALLOC_GROW */
  16         int thread_id;
  17 };
  18
  19 /*
  20  * Create TLS data for the current thread.  This gives us a place to
  21  * put per-thread data, such as thread start time, function nesting
  22  * and a per-thread label for our messages.
  23  *
  24  * We assume the first thread is "main".  Other threads are given
  25  * non-zero thread-ids to help distinguish messages from concurrent
  26  * threads.
  27  *
  28  * Truncate the thread name if necessary to help with column alignment
  29  * in printf-style messages.
  30  *
  31  * In this and all following functions the term "self" refers to the
  32  * current thread.
  33  */
  34 struct tr2tls_thread_ctx *tr2tls_create_self(const char *thread_name,
  35                                              uint64_t us_thread_start);
  36
  37 /*
  38  * Get our TLS data.
  39  */
  40 struct tr2tls_thread_ctx *tr2tls_get_self(void);
  41
  42 /*
  43  * return true if the current thread is the main thread.
  44  */
  45 int tr2tls_is_main_thread(void);
  46
  47 /*
  48  * Free our TLS data.
  49  */
  50 void tr2tls_unset_self(void);
  51
  52 /*
  53  * Begin a new nested region and remember the start time.
  54  */
  55 void tr2tls_push_self(uint64_t us_now);
  56
  57 /*
  58  * End the innermost nested region.
  59  */
  60 void tr2tls_pop_self(void);
  61
  62 /*
  63  * Pop any extra (above the first) open regions on the current
  64  * thread and discard.  During a thread-exit, we should only
  65  * have region[0] that was pushed in trace2_thread_start() if
  66  * the thread exits normally.
  67  */
  68 void tr2tls_pop_unwind_self(void);
  69
  70 /*
  71  * Compute the elapsed time since the innermost region in the
  72  * current thread started and the given time (usually now).
  73  */
  74 uint64_t tr2tls_region_elasped_self(uint64_t us);
  75
  76 /*
  77  * Compute the elapsed time since the main thread started
  78  * and the given time (usually now).  This is assumed to
  79  * be the absolute run time of the process.
  80  */
  81 uint64_t tr2tls_absolute_elapsed(uint64_t us);
  82
  83 /*
  84  * Initialize the tr2 TLS system.
  85  */
  86 void tr2tls_init(void);
  87
  88 /*
  89  * Free all tr2 TLS resources.
  90  */
  91 void tr2tls_release(void);
  92
  93 /*
  94  * Protected increment of an integer.
  95  */
  96 int tr2tls_locked_increment(int *p);
  97
  98 /*
  99  * Capture the process start time and do nothing else.
 100  */
 101 void tr2tls_start_process_clock(void);
 102
 103 #endif /* TR2_TLS_H */