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Diffstat (limited to '')
| -rw-r--r-- | src/zstd/programs/util.h | 757 |
1 files changed, 757 insertions, 0 deletions
diff --git a/src/zstd/programs/util.h b/src/zstd/programs/util.h new file mode 100644 index 00000000..c8be5f5f --- /dev/null +++ b/src/zstd/programs/util.h @@ -0,0 +1,757 @@ +/* + * Copyright (c) 2016-present, Przemyslaw Skibinski, Yann Collet, Facebook, Inc. + * All rights reserved. + * + * This source code is licensed under both the BSD-style license (found in the + * LICENSE file in the root directory of this source tree) and the GPLv2 (found + * in the COPYING file in the root directory of this source tree). + * You may select, at your option, one of the above-listed licenses. + */ + +#ifndef UTIL_H_MODULE +#define UTIL_H_MODULE + +#if defined (__cplusplus) +extern "C" { +#endif + + + +/*-**************************************** +* Dependencies +******************************************/ +#include "platform.h" /* PLATFORM_POSIX_VERSION */ +#include <stdlib.h> /* malloc */ +#include <stddef.h> /* size_t, ptrdiff_t */ +#include <stdio.h> /* fprintf */ +#include <string.h> /* strncmp */ +#include <sys/types.h> /* stat, utime */ +#include <sys/stat.h> /* stat */ +#if defined(_MSC_VER) +# include <sys/utime.h> /* utime */ +# include <io.h> /* _chmod */ +#else +# include <unistd.h> /* chown, stat */ +# include <utime.h> /* utime */ +#endif +#include <time.h> /* time */ +#include <errno.h> +#include "mem.h" /* U32, U64 */ + + +/* ************************************************************ +* Avoid fseek()'s 2GiB barrier with MSVC, MacOS, *BSD, MinGW +***************************************************************/ +#if defined(_MSC_VER) && (_MSC_VER >= 1400) +# define UTIL_fseek _fseeki64 +#elif !defined(__64BIT__) && (PLATFORM_POSIX_VERSION >= 200112L) /* No point defining Large file for 64 bit */ +# define UTIL_fseek fseeko +#elif defined(__MINGW32__) && defined(__MSVCRT__) && !defined(__STRICT_ANSI__) && !defined(__NO_MINGW_LFS) +# define UTIL_fseek fseeko64 +#else +# define UTIL_fseek fseek +#endif + + +/*-**************************************** +* Sleep functions: Windows - Posix - others +******************************************/ +#if defined(_WIN32) +# include <windows.h> +# define SET_REALTIME_PRIORITY SetPriorityClass(GetCurrentProcess(), REALTIME_PRIORITY_CLASS) +# define UTIL_sleep(s) Sleep(1000*s) +# define UTIL_sleepMilli(milli) Sleep(milli) +#elif PLATFORM_POSIX_VERSION >= 0 /* Unix-like operating system */ +# include <unistd.h> +# include <sys/resource.h> /* setpriority */ +# include <time.h> /* clock_t, nanosleep, clock, CLOCKS_PER_SEC */ +# if defined(PRIO_PROCESS) +# define SET_REALTIME_PRIORITY setpriority(PRIO_PROCESS, 0, -20) +# else +# define SET_REALTIME_PRIORITY /* disabled */ +# endif +# define UTIL_sleep(s) sleep(s) +# if (defined(__linux__) && (PLATFORM_POSIX_VERSION >= 199309L)) || (PLATFORM_POSIX_VERSION >= 200112L) /* nanosleep requires POSIX.1-2001 */ +# define UTIL_sleepMilli(milli) { struct timespec t; t.tv_sec=0; t.tv_nsec=milli*1000000ULL; nanosleep(&t, NULL); } +# else +# define UTIL_sleepMilli(milli) /* disabled */ +# endif +#else +# define SET_REALTIME_PRIORITY /* disabled */ +# define UTIL_sleep(s) /* disabled */ +# define UTIL_sleepMilli(milli) /* disabled */ +#endif + + +/* ************************************* +* Constants +***************************************/ +#define LIST_SIZE_INCREASE (8*1024) + + +/*-**************************************** +* Compiler specifics +******************************************/ +#if defined(__INTEL_COMPILER) +# pragma warning(disable : 177) /* disable: message #177: function was declared but never referenced, useful with UTIL_STATIC */ +#endif +#if defined(__GNUC__) +# define UTIL_STATIC static __attribute__((unused)) +#elif defined (__cplusplus) || (defined (__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) /* C99 */) +# define UTIL_STATIC static inline +#elif defined(_MSC_VER) +# define UTIL_STATIC static __inline +#else +# define UTIL_STATIC static /* this version may generate warnings for unused static functions; disable the relevant warning */ +#endif + + +/*-**************************************** +* Console log +******************************************/ +static int g_utilDisplayLevel; +#define UTIL_DISPLAY(...) fprintf(stderr, __VA_ARGS__) +#define UTIL_DISPLAYLEVEL(l, ...) { if (g_utilDisplayLevel>=l) { UTIL_DISPLAY(__VA_ARGS__); } } + + +/*-**************************************** +* Time functions +******************************************/ +#if defined(_WIN32) /* Windows */ + typedef LARGE_INTEGER UTIL_time_t; + UTIL_STATIC UTIL_time_t UTIL_getTime(void) { UTIL_time_t x; QueryPerformanceCounter(&x); return x; } + UTIL_STATIC U64 UTIL_getSpanTimeMicro(UTIL_time_t clockStart, UTIL_time_t clockEnd) + { + static LARGE_INTEGER ticksPerSecond; + static int init = 0; + if (!init) { + if (!QueryPerformanceFrequency(&ticksPerSecond)) + UTIL_DISPLAYLEVEL(1, "ERROR: QueryPerformanceFrequency() failure\n"); + init = 1; + } + return 1000000ULL*(clockEnd.QuadPart - clockStart.QuadPart)/ticksPerSecond.QuadPart; + } + UTIL_STATIC U64 UTIL_getSpanTimeNano(UTIL_time_t clockStart, UTIL_time_t clockEnd) + { + static LARGE_INTEGER ticksPerSecond; + static int init = 0; + if (!init) { + if (!QueryPerformanceFrequency(&ticksPerSecond)) + UTIL_DISPLAYLEVEL(1, "ERROR: QueryPerformanceFrequency() failure\n"); + init = 1; + } + return 1000000000ULL*(clockEnd.QuadPart - clockStart.QuadPart)/ticksPerSecond.QuadPart; + } +#elif defined(__APPLE__) && defined(__MACH__) + #include <mach/mach_time.h> + typedef U64 UTIL_time_t; + UTIL_STATIC UTIL_time_t UTIL_getTime(void) { return mach_absolute_time(); } + UTIL_STATIC U64 UTIL_getSpanTimeMicro(UTIL_time_t clockStart, UTIL_time_t clockEnd) + { + static mach_timebase_info_data_t rate; + static int init = 0; + if (!init) { + mach_timebase_info(&rate); + init = 1; + } + return (((clockEnd - clockStart) * (U64)rate.numer) / ((U64)rate.denom))/1000ULL; + } + UTIL_STATIC U64 UTIL_getSpanTimeNano(UTIL_time_t clockStart, UTIL_time_t clockEnd) + { + static mach_timebase_info_data_t rate; + static int init = 0; + if (!init) { + mach_timebase_info(&rate); + init = 1; + } + return ((clockEnd - clockStart) * (U64)rate.numer) / ((U64)rate.denom); + } +#elif (PLATFORM_POSIX_VERSION >= 200112L) + #include <time.h> + typedef struct timespec UTIL_freq_t; + typedef struct timespec UTIL_time_t; + UTIL_STATIC UTIL_time_t UTIL_getTime(void) + { + UTIL_time_t time; + if (clock_gettime(CLOCK_MONOTONIC, &time)) + UTIL_DISPLAYLEVEL(1, "ERROR: Failed to get time\n"); /* we could also exit() */ + return time; + } + UTIL_STATIC UTIL_time_t UTIL_getSpanTime(UTIL_time_t begin, UTIL_time_t end) + { + UTIL_time_t diff; + if (end.tv_nsec < begin.tv_nsec) { + diff.tv_sec = (end.tv_sec - 1) - begin.tv_sec; + diff.tv_nsec = (end.tv_nsec + 1000000000ULL) - begin.tv_nsec; + } else { + diff.tv_sec = end.tv_sec - begin.tv_sec; + diff.tv_nsec = end.tv_nsec - begin.tv_nsec; + } + return diff; + } + UTIL_STATIC U64 UTIL_getSpanTimeMicro(UTIL_time_t begin, UTIL_time_t end) + { + UTIL_time_t const diff = UTIL_getSpanTime(begin, end); + U64 micro = 0; + micro += 1000000ULL * diff.tv_sec; + micro += diff.tv_nsec / 1000ULL; + return micro; + } + UTIL_STATIC U64 UTIL_getSpanTimeNano(UTIL_time_t begin, UTIL_time_t end) + { + UTIL_time_t const diff = UTIL_getSpanTime(begin, end); + U64 nano = 0; + nano += 1000000000ULL * diff.tv_sec; + nano += diff.tv_nsec; + return nano; + } +#else /* relies on standard C (note : clock_t measurements can be wrong when using multi-threading) */ + typedef clock_t UTIL_time_t; + UTIL_STATIC UTIL_time_t UTIL_getTime(void) { return clock(); } + UTIL_STATIC U64 UTIL_getSpanTimeMicro(UTIL_time_t clockStart, UTIL_time_t clockEnd) { return 1000000ULL * (clockEnd - clockStart) / CLOCKS_PER_SEC; } + UTIL_STATIC U64 UTIL_getSpanTimeNano(UTIL_time_t clockStart, UTIL_time_t clockEnd) { return 1000000000ULL * (clockEnd - clockStart) / CLOCKS_PER_SEC; } +#endif + + +/* returns time span in microseconds */ +UTIL_STATIC U64 UTIL_clockSpanMicro( UTIL_time_t clockStart ) +{ + UTIL_time_t const clockEnd = UTIL_getTime(); + return UTIL_getSpanTimeMicro(clockStart, clockEnd); +} + + +UTIL_STATIC void UTIL_waitForNextTick(void) +{ + UTIL_time_t const clockStart = UTIL_getTime(); + UTIL_time_t clockEnd; + do { + clockEnd = UTIL_getTime(); + } while (UTIL_getSpanTimeNano(clockStart, clockEnd) == 0); +} + + + +/*-**************************************** +* File functions +******************************************/ +#if defined(_MSC_VER) + #define chmod _chmod + typedef struct __stat64 stat_t; +#else + typedef struct stat stat_t; +#endif + + +UTIL_STATIC int UTIL_setFileStat(const char *filename, stat_t *statbuf) +{ + int res = 0; + struct utimbuf timebuf; + + timebuf.actime = time(NULL); + timebuf.modtime = statbuf->st_mtime; + res += utime(filename, &timebuf); /* set access and modification times */ + +#if !defined(_WIN32) + res += chown(filename, statbuf->st_uid, statbuf->st_gid); /* Copy ownership */ +#endif + + res += chmod(filename, statbuf->st_mode & 07777); /* Copy file permissions */ + + errno = 0; + return -res; /* number of errors is returned */ +} + + +UTIL_STATIC int UTIL_getFileStat(const char* infilename, stat_t *statbuf) +{ + int r; +#if defined(_MSC_VER) + r = _stat64(infilename, statbuf); + if (r || !(statbuf->st_mode & S_IFREG)) return 0; /* No good... */ +#else + r = stat(infilename, statbuf); + if (r || !S_ISREG(statbuf->st_mode)) return 0; /* No good... */ +#endif + return 1; +} + + +UTIL_STATIC int UTIL_isRegularFile(const char* infilename) +{ + stat_t statbuf; + return UTIL_getFileStat(infilename, &statbuf); /* Only need to know whether it is a regular file */ +} + + +UTIL_STATIC U32 UTIL_isDirectory(const char* infilename) +{ + int r; + stat_t statbuf; +#if defined(_MSC_VER) + r = _stat64(infilename, &statbuf); + if (!r && (statbuf.st_mode & _S_IFDIR)) return 1; +#else + r = stat(infilename, &statbuf); + if (!r && S_ISDIR(statbuf.st_mode)) return 1; +#endif + return 0; +} + +UTIL_STATIC U32 UTIL_isLink(const char* infilename) +{ +#if defined(_WIN32) + /* no symlinks on windows */ + (void)infilename; +#else + int r; + stat_t statbuf; + r = lstat(infilename, &statbuf); + if (!r && S_ISLNK(statbuf.st_mode)) return 1; +#endif + return 0; +} + + +UTIL_STATIC U64 UTIL_getFileSize(const char* infilename) +{ + int r; +#if defined(_MSC_VER) + struct __stat64 statbuf; + r = _stat64(infilename, &statbuf); + if (r || !(statbuf.st_mode & S_IFREG)) return 0; /* No good... */ +#elif defined(__MINGW32__) && defined (__MSVCRT__) + struct _stati64 statbuf; + r = _stati64(infilename, &statbuf); + if (r || !(statbuf.st_mode & S_IFREG)) return 0; /* No good... */ +#else + struct stat statbuf; + r = stat(infilename, &statbuf); + if (r || !S_ISREG(statbuf.st_mode)) return 0; /* No good... */ +#endif + return (U64)statbuf.st_size; +} + + +UTIL_STATIC U64 UTIL_getTotalFileSize(const char** fileNamesTable, unsigned nbFiles) +{ + U64 total = 0; + unsigned n; + for (n=0; n<nbFiles; n++) + total += UTIL_getFileSize(fileNamesTable[n]); + return total; +} + + +/* + * A modified version of realloc(). + * If UTIL_realloc() fails the original block is freed. +*/ +UTIL_STATIC void *UTIL_realloc(void *ptr, size_t size) +{ + void *newptr = realloc(ptr, size); + if (newptr) return newptr; + free(ptr); + return NULL; +} + +#ifdef _WIN32 +# define UTIL_HAS_CREATEFILELIST + +UTIL_STATIC int UTIL_prepareFileList(const char *dirName, char** bufStart, size_t* pos, char** bufEnd, int followLinks) +{ + char* path; + int dirLength, fnameLength, pathLength, nbFiles = 0; + WIN32_FIND_DATAA cFile; + HANDLE hFile; + + dirLength = (int)strlen(dirName); + path = (char*) malloc(dirLength + 3); + if (!path) return 0; + + memcpy(path, dirName, dirLength); + path[dirLength] = '\\'; + path[dirLength+1] = '*'; + path[dirLength+2] = 0; + + hFile=FindFirstFileA(path, &cFile); + if (hFile == INVALID_HANDLE_VALUE) { + UTIL_DISPLAYLEVEL(1, "Cannot open directory '%s'\n", dirName); + return 0; + } + free(path); + + do { + fnameLength = (int)strlen(cFile.cFileName); + path = (char*) malloc(dirLength + fnameLength + 2); + if (!path) { FindClose(hFile); return 0; } + memcpy(path, dirName, dirLength); + path[dirLength] = '\\'; + memcpy(path+dirLength+1, cFile.cFileName, fnameLength); + pathLength = dirLength+1+fnameLength; + path[pathLength] = 0; + if (cFile.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) { + if (strcmp (cFile.cFileName, "..") == 0 || + strcmp (cFile.cFileName, ".") == 0) continue; + + nbFiles += UTIL_prepareFileList(path, bufStart, pos, bufEnd, followLinks); /* Recursively call "UTIL_prepareFileList" with the new path. */ + if (*bufStart == NULL) { free(path); FindClose(hFile); return 0; } + } + else if ((cFile.dwFileAttributes & FILE_ATTRIBUTE_NORMAL) || (cFile.dwFileAttributes & FILE_ATTRIBUTE_ARCHIVE) || (cFile.dwFileAttributes & FILE_ATTRIBUTE_COMPRESSED)) { + if (*bufStart + *pos + pathLength >= *bufEnd) { + ptrdiff_t newListSize = (*bufEnd - *bufStart) + LIST_SIZE_INCREASE; + *bufStart = (char*)UTIL_realloc(*bufStart, newListSize); + *bufEnd = *bufStart + newListSize; + if (*bufStart == NULL) { free(path); FindClose(hFile); return 0; } + } + if (*bufStart + *pos + pathLength < *bufEnd) { + strncpy(*bufStart + *pos, path, *bufEnd - (*bufStart + *pos)); + *pos += pathLength + 1; + nbFiles++; + } + } + free(path); + } while (FindNextFileA(hFile, &cFile)); + + FindClose(hFile); + return nbFiles; +} + +#elif defined(__linux__) || (PLATFORM_POSIX_VERSION >= 200112L) /* opendir, readdir require POSIX.1-2001 */ +# define UTIL_HAS_CREATEFILELIST +# include <dirent.h> /* opendir, readdir */ +# include <string.h> /* strerror, memcpy */ + +UTIL_STATIC int UTIL_prepareFileList(const char *dirName, char** bufStart, size_t* pos, char** bufEnd, int followLinks) +{ + DIR *dir; + struct dirent *entry; + char* path; + int dirLength, fnameLength, pathLength, nbFiles = 0; + + if (!(dir = opendir(dirName))) { + UTIL_DISPLAYLEVEL(1, "Cannot open directory '%s': %s\n", dirName, strerror(errno)); + return 0; + } + + dirLength = (int)strlen(dirName); + errno = 0; + while ((entry = readdir(dir)) != NULL) { + if (strcmp (entry->d_name, "..") == 0 || + strcmp (entry->d_name, ".") == 0) continue; + fnameLength = (int)strlen(entry->d_name); + path = (char*) malloc(dirLength + fnameLength + 2); + if (!path) { closedir(dir); return 0; } + memcpy(path, dirName, dirLength); + + path[dirLength] = '/'; + memcpy(path+dirLength+1, entry->d_name, fnameLength); + pathLength = dirLength+1+fnameLength; + path[pathLength] = 0; + + if (!followLinks && UTIL_isLink(path)) { + UTIL_DISPLAYLEVEL(2, "Warning : %s is a symbolic link, ignoring\n", path); + continue; + } + + if (UTIL_isDirectory(path)) { + nbFiles += UTIL_prepareFileList(path, bufStart, pos, bufEnd, followLinks); /* Recursively call "UTIL_prepareFileList" with the new path. */ + if (*bufStart == NULL) { free(path); closedir(dir); return 0; } + } else { + if (*bufStart + *pos + pathLength >= *bufEnd) { + ptrdiff_t newListSize = (*bufEnd - *bufStart) + LIST_SIZE_INCREASE; + *bufStart = (char*)UTIL_realloc(*bufStart, newListSize); + *bufEnd = *bufStart + newListSize; + if (*bufStart == NULL) { free(path); closedir(dir); return 0; } + } + if (*bufStart + *pos + pathLength < *bufEnd) { + strncpy(*bufStart + *pos, path, *bufEnd - (*bufStart + *pos)); + *pos += pathLength + 1; + nbFiles++; + } + } + free(path); + errno = 0; /* clear errno after UTIL_isDirectory, UTIL_prepareFileList */ + } + + if (errno != 0) { + UTIL_DISPLAYLEVEL(1, "readdir(%s) error: %s\n", dirName, strerror(errno)); + free(*bufStart); + *bufStart = NULL; + } + closedir(dir); + return nbFiles; +} + +#else + +UTIL_STATIC int UTIL_prepareFileList(const char *dirName, char** bufStart, size_t* pos, char** bufEnd, int followLinks) +{ + (void)bufStart; (void)bufEnd; (void)pos; + UTIL_DISPLAYLEVEL(1, "Directory %s ignored (compiled without _WIN32 or _POSIX_C_SOURCE)\n", dirName); + return 0; +} + +#endif /* #ifdef _WIN32 */ + +/* + * UTIL_createFileList - takes a list of files and directories (params: inputNames, inputNamesNb), scans directories, + * and returns a new list of files (params: return value, allocatedBuffer, allocatedNamesNb). + * After finishing usage of the list the structures should be freed with UTIL_freeFileList(params: return value, allocatedBuffer) + * In case of error UTIL_createFileList returns NULL and UTIL_freeFileList should not be called. + */ +UTIL_STATIC const char** UTIL_createFileList(const char **inputNames, unsigned inputNamesNb, char** allocatedBuffer, unsigned* allocatedNamesNb, int followLinks) +{ + size_t pos; + unsigned i, nbFiles; + char* buf = (char*)malloc(LIST_SIZE_INCREASE); + char* bufend = buf + LIST_SIZE_INCREASE; + const char** fileTable; + + if (!buf) return NULL; + + for (i=0, pos=0, nbFiles=0; i<inputNamesNb; i++) { + if (!UTIL_isDirectory(inputNames[i])) { + size_t const len = strlen(inputNames[i]); + if (buf + pos + len >= bufend) { + ptrdiff_t newListSize = (bufend - buf) + LIST_SIZE_INCREASE; + buf = (char*)UTIL_realloc(buf, newListSize); + bufend = buf + newListSize; + if (!buf) return NULL; + } + if (buf + pos + len < bufend) { + strncpy(buf + pos, inputNames[i], bufend - (buf + pos)); + pos += len + 1; + nbFiles++; + } + } else { + nbFiles += UTIL_prepareFileList(inputNames[i], &buf, &pos, &bufend, followLinks); + if (buf == NULL) return NULL; + } } + + if (nbFiles == 0) { free(buf); return NULL; } + + fileTable = (const char**)malloc((nbFiles+1) * sizeof(const char*)); + if (!fileTable) { free(buf); return NULL; } + + for (i=0, pos=0; i<nbFiles; i++) { + fileTable[i] = buf + pos; + pos += strlen(fileTable[i]) + 1; + } + + if (buf + pos > bufend) { free(buf); free((void*)fileTable); return NULL; } + + *allocatedBuffer = buf; + *allocatedNamesNb = nbFiles; + + return fileTable; +} + + +UTIL_STATIC void UTIL_freeFileList(const char** filenameTable, char* allocatedBuffer) +{ + if (allocatedBuffer) free(allocatedBuffer); + if (filenameTable) free((void*)filenameTable); +} + +/* count the number of physical cores */ +#if defined(_WIN32) || defined(WIN32) + +#include <windows.h> + +typedef BOOL(WINAPI* LPFN_GLPI)(PSYSTEM_LOGICAL_PROCESSOR_INFORMATION, PDWORD); + +UTIL_STATIC int UTIL_countPhysicalCores(void) +{ + static int numPhysicalCores = 0; + if (numPhysicalCores != 0) return numPhysicalCores; + + { LPFN_GLPI glpi; + BOOL done = FALSE; + PSYSTEM_LOGICAL_PROCESSOR_INFORMATION buffer = NULL; + PSYSTEM_LOGICAL_PROCESSOR_INFORMATION ptr = NULL; + DWORD returnLength = 0; + size_t byteOffset = 0; + + glpi = (LPFN_GLPI)GetProcAddress(GetModuleHandle(TEXT("kernel32")), + "GetLogicalProcessorInformation"); + + if (glpi == NULL) { + goto failed; + } + + while(!done) { + DWORD rc = glpi(buffer, &returnLength); + if (FALSE == rc) { + if (GetLastError() == ERROR_INSUFFICIENT_BUFFER) { + if (buffer) + free(buffer); + buffer = (PSYSTEM_LOGICAL_PROCESSOR_INFORMATION)malloc(returnLength); + + if (buffer == NULL) { + perror("zstd"); + exit(1); + } + } else { + /* some other error */ + goto failed; + } + } else { + done = TRUE; + } + } + + ptr = buffer; + + while (byteOffset + sizeof(SYSTEM_LOGICAL_PROCESSOR_INFORMATION) <= returnLength) { + + if (ptr->Relationship == RelationProcessorCore) { + numPhysicalCores++; + } + + ptr++; + byteOffset += sizeof(SYSTEM_LOGICAL_PROCESSOR_INFORMATION); + } + + free(buffer); + + return numPhysicalCores; + } + +failed: + /* try to fall back on GetSystemInfo */ + { SYSTEM_INFO sysinfo; + GetSystemInfo(&sysinfo); + numPhysicalCores = sysinfo.dwNumberOfProcessors; + if (numPhysicalCores == 0) numPhysicalCores = 1; /* just in case */ + } + return numPhysicalCores; +} + +#elif defined(__APPLE__) + +#include <sys/sysctl.h> + +/* Use apple-provided syscall + * see: man 3 sysctl */ +UTIL_STATIC int UTIL_countPhysicalCores(void) +{ + static S32 numPhysicalCores = 0; /* apple specifies int32_t */ + if (numPhysicalCores != 0) return numPhysicalCores; + + { size_t size = sizeof(S32); + int const ret = sysctlbyname("hw.physicalcpu", &numPhysicalCores, &size, NULL, 0); + if (ret != 0) { + if (errno == ENOENT) { + /* entry not present, fall back on 1 */ + numPhysicalCores = 1; + } else { + perror("zstd: can't get number of physical cpus"); + exit(1); + } + } + + return numPhysicalCores; + } +} + +#elif defined(__linux__) + +/* parse /proc/cpuinfo + * siblings / cpu cores should give hyperthreading ratio + * otherwise fall back on sysconf */ +UTIL_STATIC int UTIL_countPhysicalCores(void) +{ + static int numPhysicalCores = 0; + + if (numPhysicalCores != 0) return numPhysicalCores; + + numPhysicalCores = (int)sysconf(_SC_NPROCESSORS_ONLN); + if (numPhysicalCores == -1) { + /* value not queryable, fall back on 1 */ + return numPhysicalCores = 1; + } + + /* try to determine if there's hyperthreading */ + { FILE* const cpuinfo = fopen("/proc/cpuinfo", "r"); +#define BUF_SIZE 80 + char buff[BUF_SIZE]; + + int siblings = 0; + int cpu_cores = 0; + int ratio = 1; + + if (cpuinfo == NULL) { + /* fall back on the sysconf value */ + return numPhysicalCores; + } + + /* assume the cpu cores/siblings values will be constant across all + * present processors */ + while (!feof(cpuinfo)) { + if (fgets(buff, BUF_SIZE, cpuinfo) != NULL) { + if (strncmp(buff, "siblings", 8) == 0) { + const char* const sep = strchr(buff, ':'); + if (*sep == '\0') { + /* formatting was broken? */ + goto failed; + } + + siblings = atoi(sep + 1); + } + if (strncmp(buff, "cpu cores", 9) == 0) { + const char* const sep = strchr(buff, ':'); + if (*sep == '\0') { + /* formatting was broken? */ + goto failed; + } + + cpu_cores = atoi(sep + 1); + } + } else if (ferror(cpuinfo)) { + /* fall back on the sysconf value */ + goto failed; + } + } + if (siblings && cpu_cores) { + ratio = siblings / cpu_cores; + } +failed: + fclose(cpuinfo); + return numPhysicalCores = numPhysicalCores / ratio; + } +} + +#elif defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__) || defined(__DragonFly__) + +/* Use apple-provided syscall + * see: man 3 sysctl */ +UTIL_STATIC int UTIL_countPhysicalCores(void) +{ + static int numPhysicalCores = 0; + + if (numPhysicalCores != 0) return numPhysicalCores; + + numPhysicalCores = (int)sysconf(_SC_NPROCESSORS_ONLN); + if (numPhysicalCores == -1) { + /* value not queryable, fall back on 1 */ + return numPhysicalCores = 1; + } + return numPhysicalCores; +} + +#else + +UTIL_STATIC int UTIL_countPhysicalCores(void) +{ + /* assume 1 */ + return 1; +} + +#endif + +#if defined (__cplusplus) +} +#endif + +#endif /* UTIL_H_MODULE */ |