Mercurial > hg
view mercurial/bitmanipulation.h @ 47349:7138c863d0a1
dirstate-v2: Skip readdir in status based on directory mtime
When calling `read_dir` during `status` and the directory is found to be
eligible for caching (see code comments), write the directory’s mtime to the
dirstate. The presence of a directory mtime in the dirstate is meaningful
and indicates eligibility.
When an eligible directory mtime is found in the dirstate and `stat()` shows
that the mtime has not changed, `status` can skip calling `read_dir` again
and instead rely on the names of child nodes in the dirstate tree.
The `tempfile` crate is used to create a temporary file in order to use its
modification time as "current time" with the same truncation as other files
and directories would have in their own modification time.
Differential Revision: https://phab.mercurial-scm.org/D10826
author | Simon Sapin <simon.sapin@octobus.net> |
---|---|
date | Fri, 28 May 2021 11:48:59 +0200 |
parents | eed42f1c22d6 |
children | d86908050375 |
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#ifndef _HG_BITMANIPULATION_H_ #define _HG_BITMANIPULATION_H_ #include <string.h> #include "compat.h" /* Reads a 64 bit integer from big-endian bytes. Assumes that the data is long enough */ static inline uint64_t getbe64(const char *c) { const unsigned char *d = (const unsigned char *)c; return ((((uint64_t)d[0]) << 56) | (((uint64_t)d[1]) << 48) | (((uint64_t)d[2]) << 40) | (((uint64_t)d[3]) << 32) | (((uint64_t)d[4]) << 24) | (((uint64_t)d[5]) << 16) | (((uint64_t)d[6]) << 8) | (d[7])); } static inline uint32_t getbe32(const char *c) { const unsigned char *d = (const unsigned char *)c; return ((((uint32_t)d[0]) << 24) | (((uint32_t)d[1]) << 16) | (((uint32_t)d[2]) << 8) | (d[3])); } static inline int16_t getbeint16(const char *c) { const unsigned char *d = (const unsigned char *)c; return ((d[0] << 8) | (d[1])); } static inline uint16_t getbeuint16(const char *c) { const unsigned char *d = (const unsigned char *)c; return ((d[0] << 8) | (d[1])); } /* Writes a 64 bit integer to bytes in a big-endian format. Assumes that the buffer is long enough */ static inline void putbe64(uint64_t x, char *c) { c[0] = (x >> 56) & 0xff; c[1] = (x >> 48) & 0xff; c[2] = (x >> 40) & 0xff; c[3] = (x >> 32) & 0xff; c[4] = (x >> 24) & 0xff; c[5] = (x >> 16) & 0xff; c[6] = (x >> 8) & 0xff; c[7] = (x)&0xff; } static inline void putbe32(uint32_t x, char *c) { c[0] = (x >> 24) & 0xff; c[1] = (x >> 16) & 0xff; c[2] = (x >> 8) & 0xff; c[3] = (x)&0xff; } static inline double getbefloat64(const char *c) { const unsigned char *d = (const unsigned char *)c; double ret; int i; uint64_t t = 0; for (i = 0; i < 8; i++) { t = (t << 8) + d[i]; } memcpy(&ret, &t, sizeof(t)); return ret; } #endif