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profile-handler: use documented sigev_notify_thread_id in sigevent

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sigevent(7) is documented to have sigev_notify_thread_id as its member.
In glibc system, it's a macro expanded to the legacy _sigev_un._tid,
_sigev_un._tid is obviously an internal implementation detail as
signaled by its underscore prefix. And this macro was hidden inside
linux/signal.h in older version of glibc.

On Linux that use musl libc, sigev_notify_thread_id is also a macro, but
it's expanded to __sev_fields.sigev_notify_thread_id

[alkondratenko@gmail.com: amputated broken linux/signal.h dependency]
[alkondratenko@gmail.com: see https://github.com/gperftools/gperftools/pull/1250]
Signed-off-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>
This commit is contained in:
Đoàn Trần Công Danh 2021-02-12 19:21:18 +07:00 committed by Aliaksey Kandratsenka
parent 43459feb33
commit d9c4c3b481
1 changed files with 16 additions and 1 deletions
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17
src/profile-handler.cc
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@ -49,6 +49,9 @@
#if HAVE_LINUX_SIGEV_THREAD_ID
// for timer_{create,settime} and associated typedefs & constants
#include <time.h>
// for sigevent
#include <signal.h>
// for sys_gettid
#include "base/linux_syscall_support.h"
// for perftools_pthread_key_create
@ -61,6 +64,18 @@
#include "base/spinlock.h"
#include "maybe_threads.h"
// Some Linux systems don't have sigev_notify_thread_id defined in
// signal.h (despite having SIGEV_THREAD_ID defined) and also lack
// working linux/signal.h. So lets workaround. Note, we know that at
// least on Linux sigev_notify_thread_id is macro.
//
// See https://sourceware.org/bugzilla/show_bug.cgi?id=27417 and
// https://bugzilla.kernel.org/show_bug.cgi?id=200081
//
#if __linux__ && HAVE_LINUX_SIGEV_THREAD_ID && !defined(sigev_notify_thread_id)
#define sigev_notify_thread_id _sigev_un._tid
#endif
using std::list;
using std::string;
@ -272,7 +287,7 @@ static void StartLinuxThreadTimer(int timer_type, int signal_number,
struct itimerspec its;
memset(&sevp, 0, sizeof(sevp));
sevp.sigev_notify = SIGEV_THREAD_ID;
sevp._sigev_un._tid = sys_gettid();
sevp.sigev_notify_thread_id = sys_gettid();
sevp.sigev_signo = signal_number;
clockid_t clock = CLOCK_THREAD_CPUTIME_ID;
if (timer_type == ITIMER_REAL) {