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pvやmbufferの簡易版みたいなもの 送信待ちの間に変換処理が失速しがちなため
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,142 @@ | ||
| /* asyncbuf.c: 標準入力をバッファして標準出力する (2020-08-23) | ||
| * WTFPL2 ( http://en.wikipedia.org/wiki/WTFPL#Version_2 ) | ||
| */ | ||
| #define _CRT_SECURE_NO_WARNINGS | ||
| #include <stdlib.h> | ||
| #include <stdio.h> | ||
| #include <fcntl.h> | ||
| #include <io.h> | ||
| #define WIN32_LEAN_AND_MEAN | ||
| #include <windows.h> | ||
| #include <process.h> | ||
|
|
||
| static const size_t BUF_UNIT_SIZE = 65536; | ||
| static HANDLE g_evenq; | ||
| static HANDLE g_evdeq; | ||
| static CRITICAL_SECTION g_cs; | ||
| static HANDLE g_th; | ||
| static char *g_buf; | ||
| static size_t g_size; | ||
| static size_t g_fill; | ||
| static size_t g_front; | ||
| static size_t g_rear; | ||
| static int g_closing; | ||
|
|
||
| static UINT WINAPI worker(void *p) | ||
| { | ||
| (void)p; | ||
| for (;;) { | ||
| size_t remain; | ||
| EnterCriticalSection(&g_cs); | ||
| remain = (g_size + g_rear - g_front) % g_size; | ||
| if ((g_closing || remain >= g_fill) && remain >= (g_closing ? 1 : BUF_UNIT_SIZE)) { | ||
| size_t n = remain < BUF_UNIT_SIZE ? remain : BUF_UNIT_SIZE; | ||
| LeaveCriticalSection(&g_cs); | ||
| g_fill = 0; | ||
| if (n > g_size - g_front) { | ||
| n = g_size - g_front; | ||
| } | ||
| if (fwrite(g_buf + g_front, 1, n, stdout) != n) { | ||
| EnterCriticalSection(&g_cs); | ||
| g_closing = 1; | ||
| LeaveCriticalSection(&g_cs); | ||
| SetEvent(g_evdeq); | ||
| break; | ||
| } | ||
| EnterCriticalSection(&g_cs); | ||
| g_front = (g_front + n) % g_size; | ||
| LeaveCriticalSection(&g_cs); | ||
| SetEvent(g_evdeq); | ||
| } else if (g_closing) { | ||
| LeaveCriticalSection(&g_cs); | ||
| break; | ||
| } else { | ||
| LeaveCriticalSection(&g_cs); | ||
| WaitForSingleObject(g_evenq, INFINITE); | ||
| } | ||
| } | ||
| fflush(stdout); | ||
| return 0; | ||
| } | ||
|
|
||
| int wmain(int argc, wchar_t **argv) | ||
| { | ||
| if (argc != 3) { | ||
| fputs("Usage: asyncbuf buf_size_bytes initial_fill_bytes\n", stderr); | ||
| return 2; | ||
| } | ||
| if (_setmode(_fileno(stdin), _O_BINARY) < 0 || _setmode(_fileno(stdout), _O_BINARY) < 0) { | ||
| return 1; | ||
| } | ||
| g_size = wcstoul(argv[1], NULL, 10); | ||
| if (g_size < BUF_UNIT_SIZE * 2) { | ||
| g_size = BUF_UNIT_SIZE * 2; | ||
| } else if (g_size > 1024 * 1024 * 1024) { | ||
| g_size = 1024 * 1024 * 1024; | ||
| } | ||
| g_fill = wcstoul(argv[2], NULL, 10); | ||
| if (g_fill > g_size - BUF_UNIT_SIZE * 2) { | ||
| g_fill = g_size - BUF_UNIT_SIZE * 2; | ||
| } | ||
| g_buf = (char *)malloc(g_size); | ||
| if (!g_buf) { | ||
| return 1; | ||
| } | ||
| g_evenq = CreateEvent(NULL, FALSE, FALSE, NULL); | ||
| if (!g_evenq) { | ||
| free(g_buf); | ||
| return 1; | ||
| } | ||
| g_evdeq = CreateEvent(NULL, FALSE, FALSE, NULL); | ||
| if (!g_evdeq) { | ||
| CloseHandle(g_evenq); | ||
| free(g_buf); | ||
| return 1; | ||
| } | ||
| InitializeCriticalSection(&g_cs); | ||
| g_th = (HANDLE)_beginthreadex(NULL, 0, worker, NULL, 0, NULL); | ||
| if (!g_th) { | ||
| DeleteCriticalSection(&g_cs); | ||
| CloseHandle(g_evdeq); | ||
| CloseHandle(g_evenq); | ||
| free(g_buf); | ||
| return 1; | ||
| } | ||
|
|
||
| for (;;) { | ||
| EnterCriticalSection(&g_cs); | ||
| if ((g_size + g_front - g_rear - 1) % g_size >= BUF_UNIT_SIZE) { | ||
| size_t n = BUF_UNIT_SIZE; | ||
| LeaveCriticalSection(&g_cs); | ||
| if (n > g_size - g_rear) { | ||
| n = g_size - g_rear; | ||
| } | ||
| n = fread(g_buf + g_rear, 1, n, stdin); | ||
| if (n == 0) { | ||
| EnterCriticalSection(&g_cs); | ||
| g_closing = 1; | ||
| LeaveCriticalSection(&g_cs); | ||
| SetEvent(g_evenq); | ||
| break; | ||
| } | ||
| EnterCriticalSection(&g_cs); | ||
| g_rear = (g_rear + n) % g_size; | ||
| LeaveCriticalSection(&g_cs); | ||
| SetEvent(g_evenq); | ||
| } else if (g_closing) { | ||
| LeaveCriticalSection(&g_cs); | ||
| break; | ||
| } else { | ||
| LeaveCriticalSection(&g_cs); | ||
| WaitForSingleObject(g_evdeq, INFINITE); | ||
| } | ||
| } | ||
|
|
||
| WaitForSingleObject(g_th, INFINITE); | ||
| CloseHandle(g_th); | ||
| DeleteCriticalSection(&g_cs); | ||
| CloseHandle(g_evdeq); | ||
| CloseHandle(g_evenq); | ||
| free(g_buf); | ||
| return 0; | ||
| } |
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