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Annotation of parser3/src/main/pa_os.C, revision 1.26

1.1       paf         1: /** @file
                      2:        Parser: commonly functions.
                      3: 
1.26    ! moko        4:        Copyright (c) 2001-2026 Art. Lebedev Studio (https://www.artlebedev.com)
1.20      moko        5:        Authors: Konstantin Morshnev <moko@design.ru>, Alexandr Petrosian <paf@design.ru>
1.1       paf         6: */
                      7: 
                      8: #include "pa_config_includes.h"
                      9: #include "pa_os.h"
                     10: 
1.26    ! moko       11: volatile const char * IDENT_PA_OS_C="$Id: pa_os.C,v 1.25 2024/11/04 17:47:46 moko Exp $" IDENT_PA_OS_H; 
1.17      moko       12: 
                     13: unsigned int pa_lock_attempts=PA_LOCK_ATTEMPTS;
1.12      moko       14: 
1.13      moko       15: #ifdef _MSC_VER
                     16: #include <windows.h>
1.22      moko       17: 
                     18: #define PA_SH_LOCK 2
                     19: #define PA_EX_LOCK 1
                     20: #define PA_ULOCK 0
                     21: #define FLOCK(operation) int status=pa_flock(fd, operation);
1.23      moko       22: #define ERRNO pa_errno()
1.22      moko       23: 
                     24: int pa_flock(int fd, int operation) {
                     25:     HANDLE hFile = (HANDLE)_get_osfhandle(fd);
                     26:     if (hFile == INVALID_HANDLE_VALUE) {
                     27:         return -1;
                     28:     }
                     29: 
                     30:     OVERLAPPED overlapped = {0};
                     31: 
                     32:     if (operation == PA_ULOCK) {
                     33:         return UnlockFileEx(hFile, 0, MAXDWORD, MAXDWORD, &overlapped) ? 0 : -1;
                     34:     } else {
                     35:         DWORD flags = LOCKFILE_FAIL_IMMEDIATELY;
                     36:         if (operation == PA_EX_LOCK) {
                     37:             flags |= LOCKFILE_EXCLUSIVE_LOCK;
                     38:         }
                     39:         return LockFileEx(hFile, flags, 0, MAXDWORD, MAXDWORD, &overlapped) ? 0 : -1;
                     40:     }
                     41: }
1.23      moko       42: 
                     43: int pa_errno() {
                     44:     switch(GetLastError()) {
1.25      moko       45:         case ERROR_LOCK_VIOLATION: // real case: returning the same error as with _locking
                     46:             return EACCES;
1.23      moko       47:         case ERROR_IO_PENDING:
                     48:             return EAGAIN;
                     49:         case ERROR_INVALID_HANDLE:
                     50:             return EBADF;
                     51:         case ERROR_NOT_LOCKED:
1.24      moko       52:             return ENOLCK;
1.23      moko       53:     }
1.24      moko       54:     return EACCES;
1.23      moko       55: }
                     56: 
1.22      moko       57: #else
1.1       paf        58: 
1.23      moko       59: #define ERRNO errno
                     60: 
1.1       paf        61: #ifdef HAVE_FLOCK
                     62: 
1.9       misha      63: #define PA_SH_LOCK LOCK_SH|LOCK_NB
                     64: #define PA_EX_LOCK LOCK_EX|LOCK_NB
                     65: #define PA_ULOCK LOCK_UN
                     66: #define FLOCK(operation) int status=flock(fd, operation);
1.1       paf        67: 
                     68: #else
                     69: #ifdef HAVE_FCNTL
                     70: 
1.9       misha      71: #define PA_SH_LOCK F_RDLCK
                     72: #define PA_EX_LOCK F_WRLCK
                     73: #define PA_ULOCK F_UNLCK
                     74: #define FLOCK(operation) struct flock ls={operation, SEEK_SET}; int status=fcntl(fd, F_SETLK, &ls); 
1.1       paf        75: 
                     76: #else
                     77: #ifdef HAVE_LOCKF
                     78: 
1.9       misha      79: #define PA_SH_LOCK F_TLOCK
                     80: #define PA_EX_LOCK F_TLOCK
                     81: #define PA_ULOCK F_ULOCK
                     82: #define FLOCK(operation) lseek(fd, 0, SEEK_SET); int status=lockf(fd, operation, 1);
1.1       paf        83: 
                     84: #else
                     85: 
                     86: #error unable to find file locking func
                     87: 
                     88: #endif
                     89: #endif
                     90: #endif
1.22      moko       91: 
1.1       paf        92: #endif
                     93: 
1.9       misha      94: int pa_lock(int fd, int attempts, int operation){
                     95:        while(true){
                     96:                FLOCK(operation);
1.16      moko       97:                if(status==0)
                     98:                        return 0;
                     99:                if(--attempts<=0)
1.23      moko      100:                        return ERRNO;
1.10      misha     101:                pa_sleep(PA_LOCK_WAIT_TIMEOUT_SECS, PA_LOCK_WAIT_TIMEOUT_USECS);
1.9       misha     102:        }
                    103: };
                    104: 
                    105: int pa_lock_shared_blocking(int fd) {
1.17      moko      106:        return pa_lock(fd, pa_lock_attempts, PA_SH_LOCK);
1.9       misha     107: }
                    108: 
                    109: int pa_lock_exclusive_blocking(int fd) {
1.17      moko      110:        return pa_lock(fd, pa_lock_attempts, PA_EX_LOCK);
1.9       misha     111: }
                    112: 
                    113: int pa_lock_exclusive_nonblocking(int fd) {
                    114:        return pa_lock(fd, 1, PA_EX_LOCK);
                    115: }
                    116: 
                    117: int pa_unlock(int fd) {
                    118:        return pa_lock(fd, 1, PA_ULOCK);
                    119: }
                    120: 
                    121: 
1.1       paf       122: int pa_sleep(unsigned long secs, unsigned long usecs) {
1.11      moko      123:        if(usecs >= 1000000){
                    124:                        secs += usecs/1000000;
                    125:                        usecs = usecs%1000000;
                    126:        }
1.1       paf       127: 
1.14      moko      128: #ifdef _MSC_VER
1.1       paf       129:        Sleep(secs * 1000 + usecs / 1000); 
                    130:        return 0;
                    131: #else
                    132:        struct timeval t;
                    133:        t.tv_sec = secs;
                    134:        t.tv_usec = usecs;
1.6       paf       135:        return (select(0, NULL, NULL, NULL, &t)<0 ? errno : 0); 
1.1       paf       136: #endif
                    137: }