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comparison cutils/shasum.py @ 94:8352da172a3e

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Use "fadvise()" with POSIX_FADV_SEQUENTIAL -- if available
author Franz Glasner <f.glasner@feldmann-mg.com>
date Thu, 21 Apr 2022 16:01:19 +0200
parents 42419f57eda9
children fc2dd6afd594
comparison
equal deleted inserted replaced
93:06b2a504b8f6 94:8352da172a3e
595 use_mmap = False 595 use_mmap = False
596 if use_mmap is None: 596 if use_mmap is None:
597 use_mmap = True 597 use_mmap = True
598 if mmap is None or not use_mmap: 598 if mmap is None or not use_mmap:
599 # No mmap available or wanted -> use traditional low-level file IO 599 # No mmap available or wanted -> use traditional low-level file IO
600 fadvise = getattr(os, "posix_fadvise", None)
601 if fadvise:
602 fadvise(fd, 0, 0, os.POSIX_FADV_SEQUENTIAL)
600 while True: 603 while True:
601 try: 604 try:
602 buf = os.read(fd, READ_CHUNK_SIZE) 605 buf = os.read(fd, READ_CHUNK_SIZE)
603 except OSError as e: 606 except OSError as e:
604 if e.errno not in (errno.EAGAIN, errno.EWOULDBLOCK, 607 if e.errno not in (errno.EAGAIN, errno.EWOULDBLOCK,