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Lazy-load psapi.dll

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Let's load the `GetProcessMemoryInfo()` function dynamically. When
needed. If needed.

This is necessary because the start-up cost spent on loading dynamic
libraries is non-negligible.

Note: In contrast to how `os.c` loads libraries and obtains function
addresses, we cannot call `FreeLibrary(hDll)` here because that would
unload the `bcrypt` library before we want to use it.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
This commit is contained in:
Johannes Schindelin 2019-10-20 22:05:35 +02:00
parent 11cab6a0c0
commit 948a0c44df
1 changed files with 36 additions and 8 deletions
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44
src/stats.c
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@ -465,8 +465,6 @@ mi_msecs_t _mi_clock_end(mi_msecs_t start) {
#if defined(_WIN32)
#include <windows.h>
#include <psapi.h>
#pragma comment(lib,"psapi.lib")
static mi_msecs_t filetime_msecs(const FILETIME* ftime) {
ULARGE_INTEGER i;
@ -476,6 +474,23 @@ static mi_msecs_t filetime_msecs(const FILETIME* ftime) {
return msecs;
}
typedef struct _PROCESS_MEMORY_COUNTERS {
DWORD cb;
DWORD PageFaultCount;
SIZE_T PeakWorkingSetSize;
SIZE_T WorkingSetSize;
SIZE_T QuotaPeakPagedPoolUsage;
SIZE_T QuotaPagedPoolUsage;
SIZE_T QuotaPeakNonPagedPoolUsage;
SIZE_T QuotaNonPagedPoolUsage;
SIZE_T PagefileUsage;
SIZE_T PeakPagefileUsage;
} PROCESS_MEMORY_COUNTERS;
typedef PROCESS_MEMORY_COUNTERS* PPROCESS_MEMORY_COUNTERS;
typedef BOOL (WINAPI *PGetProcessMemoryInfo)(HANDLE, PPROCESS_MEMORY_COUNTERS, DWORD);
static PGetProcessMemoryInfo pGetProcessMemoryInfo = NULL;
static int GetProcessMemoryInfo_is_initialized = 0;
static void mi_stat_process_info(mi_msecs_t* elapsed, mi_msecs_t* utime, mi_msecs_t* stime, size_t* current_rss, size_t* peak_rss, size_t* current_commit, size_t* peak_commit, size_t* page_faults)
{
*elapsed = _mi_clock_end(mi_process_start);
@ -487,12 +502,25 @@ static void mi_stat_process_info(mi_msecs_t* elapsed, mi_msecs_t* utime, mi_msec
*utime = filetime_msecs(&ut);
*stime = filetime_msecs(&st);
PROCESS_MEMORY_COUNTERS info;
GetProcessMemoryInfo(GetCurrentProcess(), &info, sizeof(info));
*current_rss = (size_t)info.WorkingSetSize;
*peak_rss = (size_t)info.PeakWorkingSetSize;
*current_commit = (size_t)info.PagefileUsage;
*peak_commit = (size_t)info.PeakPagefileUsage;
*page_faults = (size_t)info.PageFaultCount;
if (!GetProcessMemoryInfo_is_initialized) {
HINSTANCE hDll;
hDll = LoadLibrary(TEXT("psapi.dll"));
if (hDll != NULL) {
pGetProcessMemoryInfo = (PGetProcessMemoryInfo)(void (*)(void))GetProcAddress(hDll, "GetProcessMemoryInfo");
}
GetProcessMemoryInfo_is_initialized = 1;
}
if (pGetProcessMemoryInfo) {
pGetProcessMemoryInfo(GetCurrentProcess(), &info, sizeof(info));
*current_rss = (size_t)info.WorkingSetSize;
*peak_rss = (size_t)info.PeakWorkingSetSize;
*current_commit = (size_t)info.PagefileUsage;
*peak_commit = (size_t)info.PeakPagefileUsage;
*page_faults = (size_t)info.PageFaultCount;
} else {
*current_rss = *peak_rss = *current_commit = *peak_commit = *page_faults = 0;
}
}
#elif !defined(__wasi__) && (defined(__unix__) || defined(__unix) || defined(unix) || defined(__APPLE__) || defined(__HAIKU__))