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Add global counters mechanism to Trace2. The Trace2 counters mechanism adds the ability to create a set of global counter variables and an API to increment them efficiently. Counters can optionally report per-thread usage in addition to the sum across all threads. Counter events are emitted to the Trace2 logs when a thread exits and at process exit. Counters are an alternative to `data` and `data_json` events. Counters are useful when you want to measure something across the life of the process, when you don't want per-measurement events for performance reasons, when the data does not fit conveniently within a region, or when your control flow does not easily let you write the final total. For example, you might use this to report the number of calls to unzip() or the number of de-delta steps during a checkout. Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
124 lines
3.2 KiB
C
124 lines
3.2 KiB
C
#ifndef TR2_TLS_H
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#define TR2_TLS_H
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#include "strbuf.h"
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#include "trace2/tr2_ctr.h"
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#include "trace2/tr2_tmr.h"
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/*
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* Notice: the term "TLS" refers to "thread-local storage" in the
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* Trace2 source files. This usage is borrowed from GCC and Windows.
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* There is NO relation to "transport layer security".
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*/
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/*
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* Arbitry limit for thread names for column alignment.
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*/
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#define TR2_MAX_THREAD_NAME (24)
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struct tr2tls_thread_ctx {
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const char *thread_name;
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uint64_t *array_us_start;
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size_t alloc;
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size_t nr_open_regions; /* plays role of "nr" in ALLOC_GROW */
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int thread_id;
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struct tr2_timer_block timer_block;
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struct tr2_counter_block counter_block;
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unsigned int used_any_timer:1;
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unsigned int used_any_per_thread_timer:1;
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unsigned int used_any_counter:1;
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unsigned int used_any_per_thread_counter:1;
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};
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/*
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* Create thread-local storage for the current thread.
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*
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* The first thread in the process will have:
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* { .thread_id=0, .thread_name="main" }
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* Subsequent threads are given a non-zero thread_id and a thread_name
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* constructed from the id and a thread base name (which is usually just
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* the name of the thread-proc function). For example:
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* { .thread_id=10, .thread_name="th10:fsm-listen" }
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* This helps to identify and distinguish messages from concurrent threads.
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* The ctx.thread_name field is truncated if necessary to help with column
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* alignment in printf-style messages.
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*
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* In this and all following functions the term "self" refers to the
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* current thread.
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*/
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struct tr2tls_thread_ctx *tr2tls_create_self(const char *thread_base_name,
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uint64_t us_thread_start);
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/*
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* Get the thread-local storage pointer of the current thread.
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*/
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struct tr2tls_thread_ctx *tr2tls_get_self(void);
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/*
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* return true if the current thread is the main thread.
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*/
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int tr2tls_is_main_thread(void);
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/*
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* Free the current thread's thread-local storage.
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*/
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void tr2tls_unset_self(void);
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/*
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* Begin a new nested region and remember the start time.
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*/
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void tr2tls_push_self(uint64_t us_now);
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/*
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* End the innermost nested region.
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*/
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void tr2tls_pop_self(void);
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/*
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* Pop any extra (above the first) open regions on the current
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* thread and discard. During a thread-exit, we should only
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* have region[0] that was pushed in trace2_thread_start() if
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* the thread exits normally.
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*/
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void tr2tls_pop_unwind_self(void);
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/*
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* Compute the elapsed time since the innermost region in the
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* current thread started and the given time (usually now).
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*/
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uint64_t tr2tls_region_elasped_self(uint64_t us);
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/*
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* Compute the elapsed time since the main thread started
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* and the given time (usually now). This is assumed to
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* be the absolute run time of the process.
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*/
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uint64_t tr2tls_absolute_elapsed(uint64_t us);
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/*
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* Initialize thread-local storage for Trace2.
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*/
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void tr2tls_init(void);
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/*
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* Free all Trace2 thread-local storage resources.
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*/
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void tr2tls_release(void);
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/*
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* Protected increment of an integer.
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*/
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int tr2tls_locked_increment(int *p);
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/*
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* Capture the process start time and do nothing else.
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*/
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void tr2tls_start_process_clock(void);
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/*
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* Explicitly lock/unlock our mutex.
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*/
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void tr2tls_lock(void);
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void tr2tls_unlock(void);
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#endif /* TR2_TLS_H */
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