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a70839cf36
Rename the `thread_name` argument in `tr2tls_create_self()` and `trace2_thread_start()` to be `thread_base_name` to make it clearer that the passed argument is a component used in the construction of the actual `struct tr2tls_thread_ctx.thread_name` variable. The base name will be used along with the thread id to create a unique thread name. This commit does not change how the `thread_name` field is allocated or stored within the `tr2tls_thread_ctx` structure. Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
107 lines
2.5 KiB
C
107 lines
2.5 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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/*
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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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struct strbuf 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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};
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/*
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* Create thread-local storage for the current thread.
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*
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* We assume the first thread is "main". Other threads are given
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* non-zero thread-ids to help distinguish messages from concurrent
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* threads.
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*
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* Truncate the thread name if necessary to help with column alignment
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* 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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#endif /* TR2_TLS_H */
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