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42339bc4e0
Building current GDB on Cygwin, fails like so:
/home/pedro/gdb/src/gdbsupport/run-time-clock.cc: In function ‘void get_run_time(user_cpu_time_clock::time_point&, system_cpu_time_clock::time_point&, run_time_scope ’:
/home/pedro/gdb/src/gdbsupport/run-time-clock.cc:52:13: error: ‘RUSAGE_THREAD’ was not declared in this scope; did you mean ‘SIGEV_THREAD’?
52 | who = RUSAGE_THREAD;
| ^~~~~~~~~~~~~
| SIGEV_THREAD
Cygwin does not implement RUSAGE_THREAD. Googling around, I see
Cygwin is not alone, other platforms don't support it either. For
example, here is someone suggesting an alternative for darwin/macos:
https://stackoverflow.com/questions/5652463/equivalent-to-rusage-thread-darwin
Fix this by falling back to process scope if thread scope can't be
supported. I chose this instead of returning zero usage or some other
constant, because if gdb is built without threading support, then
process-scope run time usage is the right info to return.
But instead of falling back silently, print a warning (just once),
like so:
(gdb) maint set per-command time on
⚠️ warning: per-thread run time information not available on this platform
... so that developers on other platforms at least have a hint
upfront.
This new warning also shows on platforms that don't have getrusage in
the first place, but does not show if the build doesn't support
threading at all.
New tests are added to gdb.base/maint.exp, to expect the warning, and
also to ensure other "mt per-command" sub commands don't trigger the
new warning.
Change-Id: Ie01b916b62f87006f855e31594a5ac7cf09e4c02
Approved-By: Simon Marchi <simon.marchi@efficios.com>
Approved-By: Tom Tromey <tom@tromey.com>
97 lines
2.9 KiB
C++
97 lines
2.9 KiB
C++
/* User/system CPU time clocks that follow the std::chrono interface.
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Copyright (C) 2016-2025 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#ifndef GDBSUPPORT_RUN_TIME_CLOCK_H
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#define GDBSUPPORT_RUN_TIME_CLOCK_H
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#include <chrono>
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/* Count the total amount of time spent executing in user mode. */
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struct user_cpu_time_clock
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{
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using duration = std::chrono::microseconds;
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using rep = duration::rep;
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using period = duration::period;
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using time_point = std::chrono::time_point<user_cpu_time_clock>;
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static constexpr bool is_steady = true;
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/* Use run_time_clock::now instead. */
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static time_point now () noexcept = delete;
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};
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/* Count the total amount of time spent executing in kernel mode. */
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struct system_cpu_time_clock
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{
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using duration = std::chrono::microseconds;
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using rep = duration::rep;
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using period = duration::period;
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using time_point = std::chrono::time_point<system_cpu_time_clock>;
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static constexpr bool is_steady = true;
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/* Use run_time_clock::now instead. */
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static time_point now () noexcept = delete;
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};
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/* Whether to measure time run time for the whole process or just one
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thread. */
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enum class run_time_scope
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{
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process,
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thread,
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};
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/* Return the user/system time as separate time points, if
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supported. If not supported, then the combined user+kernel time
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is returned in USER and SYSTEM is set to zero.
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SCOPE indicates whether to return the run time for the whole
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process or just for the calling thread. If the latter isn't
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supported, then returns the run time for the whole process even if
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run_time_scope::thread is requested. */
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void get_run_time (user_cpu_time_clock::time_point &user,
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system_cpu_time_clock::time_point &system,
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run_time_scope scope) noexcept;
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/* Returns true if is it possible for get_run_time above to return the
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run time for just the calling thread. */
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bool get_run_time_thread_scope_available ();
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/* Count the total amount of time spent executing in userspace+kernel
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mode. */
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struct run_time_clock
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{
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using duration = std::chrono::microseconds;
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using rep = duration::rep;
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using period = duration::period;
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using time_point = std::chrono::time_point<run_time_clock>;
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static constexpr bool is_steady = true;
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static time_point now () noexcept;
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};
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#endif /* GDBSUPPORT_RUN_TIME_CLOCK_H */
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