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-rw-r--r--lib/Support/Process.cpp25
-rw-r--r--lib/Support/Unix/Process.inc62
-rw-r--r--lib/Support/Windows/Process.inc51
3 files changed, 103 insertions, 35 deletions
diff --git a/lib/Support/Process.cpp b/lib/Support/Process.cpp
index 64a1fa237e..2c0d37bb32 100644
--- a/lib/Support/Process.cpp
+++ b/lib/Support/Process.cpp
@@ -50,6 +50,31 @@ self_process::~self_process() {
llvm_unreachable("This destructor must never be executed!");
}
+/// \brief A helper function to compute the elapsed wall-time since the program
+/// started.
+///
+/// Note that this routine actually computes the elapsed wall time since the
+/// first time it was called. However, we arrange to have it called during the
+/// startup of the process to get approximately correct results.
+static TimeValue getElapsedWallTime() {
+ static TimeValue &StartTime = *new TimeValue(TimeValue::now());
+ return TimeValue::now() - StartTime;
+}
+
+/// \brief A special global variable to ensure we call \c getElapsedWallTime
+/// during global initialization of the program.
+///
+/// Note that this variable is never referenced elsewhere. Doing so could
+/// create race conditions during program startup or shutdown.
+static volatile TimeValue DummyTimeValue = getElapsedWallTime();
+
+// Implement this routine by using the static helpers above. They're already
+// portable.
+TimeValue self_process::get_wall_time() const {
+ return getElapsedWallTime();
+}
+
+
#if defined(_MSC_VER)
#pragma warning(pop)
#endif
diff --git a/lib/Support/Unix/Process.inc b/lib/Support/Unix/Process.inc
index 9ad6272bab..a525538f78 100644
--- a/lib/Support/Unix/Process.inc
+++ b/lib/Support/Unix/Process.inc
@@ -49,6 +49,43 @@ process::id_type self_process::get_id() {
return getpid();
}
+static std::pair<TimeValue, TimeValue> getRUsageTimes() {
+#if defined(HAVE_GETRUSAGE)
+ struct rusage RU;
+ ::getrusage(RUSAGE_SELF, &RU);
+ return std::make_pair(
+ TimeValue(
+ static_cast<TimeValue::SecondsType>(RU.ru_utime.tv_sec),
+ static_cast<TimeValue::NanoSecondsType>(
+ RU.ru_utime.tv_usec * TimeValue::NANOSECONDS_PER_MICROSECOND)),
+ TimeValue(
+ static_cast<TimeValue::SecondsType>(RU.ru_stime.tv_sec),
+ static_cast<TimeValue::NanoSecondsType>(
+ RU.ru_stime.tv_usec * TimeValue::NANOSECONDS_PER_MICROSECOND)));
+#else
+#warning Cannot get usage times on this platform
+ return std::make_pair(TimeValue(), TimeValue());
+#endif
+}
+
+TimeValue self_process::get_user_time() const {
+#ifdef _POSIX_CPUTIME
+ // Try to get a high resolution CPU timer.
+ struct timespec TS;
+ if (::clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &TS) == 0)
+ return TimeValue(static_cast<TimeValue::SecondsType>(TS.tv_sec),
+ static_cast<TimeValue::NanoSecondsType>(TS.tv_nsec));
+#endif
+
+ // Otherwise fall back to rusage based timing.
+ return getRUsageTimes().first;
+}
+
+TimeValue self_process::get_system_time() const {
+ // We can only collect system time by inspecting the results of getrusage.
+ return getRUsageTimes().second;
+}
+
static unsigned getPageSize() {
#if defined(__CYGWIN__)
// On Cygwin, getpagesize() returns 64k but the page size for the purposes of
@@ -95,29 +132,10 @@ size_t Process::GetMallocUsage() {
#endif
}
-void
-Process::GetTimeUsage(TimeValue& elapsed, TimeValue& user_time,
- TimeValue& sys_time)
-{
+void Process::GetTimeUsage(TimeValue &elapsed, TimeValue &user_time,
+ TimeValue &sys_time) {
elapsed = TimeValue::now();
-#if defined(HAVE_GETRUSAGE)
- struct rusage usage;
- ::getrusage(RUSAGE_SELF, &usage);
- user_time = TimeValue(
- static_cast<TimeValue::SecondsType>( usage.ru_utime.tv_sec ),
- static_cast<TimeValue::NanoSecondsType>( usage.ru_utime.tv_usec *
- TimeValue::NANOSECONDS_PER_MICROSECOND ) );
- sys_time = TimeValue(
- static_cast<TimeValue::SecondsType>( usage.ru_stime.tv_sec ),
- static_cast<TimeValue::NanoSecondsType>( usage.ru_stime.tv_usec *
- TimeValue::NANOSECONDS_PER_MICROSECOND ) );
-#else
-#warning Cannot get usage times on this platform
- user_time.seconds(0);
- user_time.microseconds(0);
- sys_time.seconds(0);
- sys_time.microseconds(0);
-#endif
+ llvm::tie(user_time, sys_time) = getRUsageTimes();
}
int Process::GetCurrentUserId() {
diff --git a/lib/Support/Windows/Process.inc b/lib/Support/Windows/Process.inc
index 9eb611be87..789ae7ddce 100644
--- a/lib/Support/Windows/Process.inc
+++ b/lib/Support/Windows/Process.inc
@@ -43,6 +43,36 @@ process::id_type self_process::get_id() {
return GetCurrentProcess();
}
+static TimeValue getTimeValueFromFILETIME(FILETIME Time) {
+ ULARGE_INTEGER TimeInteger;
+ TimeInteger.LowPart = Time.dwLowDateTime;
+ TimeInteger.HighPart = Time.dwHighDateTime;
+
+ // FILETIME's are # of 100 nanosecond ticks (1/10th of a microsecond)
+ return TimeValue(
+ static_cast<TimeValue::SecondsType>(TimeInteger.QuadPart / 10000000),
+ static_cast<TimeValue::NanoSecondsType>(
+ (TimeInteger.QuadPart % 10000000) * 100));
+}
+
+TimeValue self_process::get_user_time() const {
+ FILETIME ProcCreate, ProcExit, KernelTime, UserTime;
+ if (GetProcessTimes(GetCurrentProcess(), &ProcCreate, &ProcExit, &KernelTime,
+ &UserTime) == 0)
+ return TimeValue();
+
+ return getTimeValueFromFILETIME(UserTime);
+}
+
+TimeValue self_process::get_system_time() const {
+ FILETIME ProcCreate, ProcExit, KernelTime, UserTime;
+ if (GetProcessTimes(GetCurrentProcess(), &ProcCreate, &ProcExit, &KernelTime,
+ &UserTime) == 0)
+ return TimeValue();
+
+ return getTimeValueFromFILETIME(KernelTime);
+}
+
// This function retrieves the page size using GetSystemInfo and is present
// solely so it can be called once to initialize the self_process member below.
static unsigned getPageSize() {
@@ -76,22 +106,17 @@ Process::GetMallocUsage()
return size;
}
-void
-Process::GetTimeUsage(
- TimeValue& elapsed, TimeValue& user_time, TimeValue& sys_time)
-{
+void Process::GetTimeUsage(TimeValue &elapsed, TimeValue &user_time,
+ TimeValue &sys_time) {
elapsed = TimeValue::now();
- uint64_t ProcCreate, ProcExit, KernelTime, UserTime;
- GetProcessTimes(GetCurrentProcess(), (FILETIME*)&ProcCreate,
- (FILETIME*)&ProcExit, (FILETIME*)&KernelTime,
- (FILETIME*)&UserTime);
+ FILETIME ProcCreate, ProcExit, KernelTime, UserTime;
+ if (GetProcessTimes(GetCurrentProcess(), &ProcCreate, &ProcExit, &KernelTime,
+ &UserTime) == 0)
+ return;
- // FILETIME's are # of 100 nanosecond ticks (1/10th of a microsecond)
- user_time.seconds( UserTime / 10000000 );
- user_time.nanoseconds( unsigned(UserTime % 10000000) * 100 );
- sys_time.seconds( KernelTime / 10000000 );
- sys_time.nanoseconds( unsigned(KernelTime % 10000000) * 100 );
+ user_time = getTimeValueFromFILETIME(UserTime);
+ sys_time = getTimeValueFromFILETIME(SystemTime);
}
int Process::GetCurrentUserId()
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