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#ifndef TR2_TLS_H
#define TR2_TLS_H
#include "strbuf.h"
#include "trace2/tr2_ctr.h"
#include "trace2/tr2_tmr.h"
/*
* Notice: the term "TLS" refers to "thread-local storage" in the
* Trace2 source files. This usage is borrowed from GCC and Windows.
* There is NO relation to "transport layer security".
*/
/*
* Arbitry limit for thread names for column alignment.
*/
#define TR2_MAX_THREAD_NAME (24)
struct tr2tls_thread_ctx {
const char *thread_name;
uint64_t *array_us_start;
size_t alloc;
size_t nr_open_regions; /* plays role of "nr" in ALLOC_GROW */
int thread_id;
struct tr2_timer_block timer_block;
struct tr2_counter_block counter_block;
unsigned int used_any_timer:1;
unsigned int used_any_per_thread_timer:1;
unsigned int used_any_counter:1;
unsigned int used_any_per_thread_counter:1;
};
/*
* Create thread-local storage for the current thread.
*
* The first thread in the process will have:
* { .thread_id=0, .thread_name="main" }
* Subsequent threads are given a non-zero thread_id and a thread_name
* constructed from the id and a thread base name (which is usually just
* the name of the thread-proc function). For example:
* { .thread_id=10, .thread_name="th10:fsm-listen" }
* This helps to identify and distinguish messages from concurrent threads.
* The ctx.thread_name field is truncated if necessary to help with column
* alignment in printf-style messages.
*
* In this and all following functions the term "self" refers to the
* current thread.
*/
struct tr2tls_thread_ctx *tr2tls_create_self(const char *thread_base_name,
uint64_t us_thread_start);
/*
* Get the thread-local storage pointer of the current thread.
*/
struct tr2tls_thread_ctx *tr2tls_get_self(void);
/*
* return true if the current thread is the main thread.
*/
int tr2tls_is_main_thread(void);
/*
* Free the current thread's thread-local storage.
*/
void tr2tls_unset_self(void);
/*
* Begin a new nested region and remember the start time.
*/
void tr2tls_push_self(uint64_t us_now);
/*
* End the innermost nested region.
*/
void tr2tls_pop_self(void);
/*
* Pop any extra (above the first) open regions on the current
* thread and discard. During a thread-exit, we should only
* have region[0] that was pushed in trace2_thread_start() if
* the thread exits normally.
*/
void tr2tls_pop_unwind_self(void);
/*
* Compute the elapsed time since the innermost region in the
* current thread started and the given time (usually now).
*/
uint64_t tr2tls_region_elasped_self(uint64_t us);
/*
* Compute the elapsed time since the main thread started
* and the given time (usually now). This is assumed to
* be the absolute run time of the process.
*/
uint64_t tr2tls_absolute_elapsed(uint64_t us);
/*
* Initialize thread-local storage for Trace2.
*/
void tr2tls_init(void);
/*
* Free all Trace2 thread-local storage resources.
*/
void tr2tls_release(void);
/*
* Protected increment of an integer.
*/
int tr2tls_locked_increment(int *p);
/*
* Capture the process start time and do nothing else.
*/
void tr2tls_start_process_clock(void);
/*
* Explicitly lock/unlock our mutex.
*/
void tr2tls_lock(void);
void tr2tls_unlock(void);
#endif /* TR2_TLS_H */
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