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LevelDB: use PosixWriteableFile only on MacOS X

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mmap is proven on the other platforms, we are not changing it at
the last moment before release.
This commit is contained in:
Warren Togami 2013-12-02 19:21:46 -10:00
parent 648c6f4510
commit 91a94eb4ea
1 changed files with 23 additions and 0 deletions
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23
src/leveldb/util/env_posix.cc
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@ -377,6 +377,7 @@ class PosixMmapFile : public WritableFile {
}
};
#if defined(OS_MACOSX)
class PosixWriteableFile : public WritableFile {
private:
std::string filename_;
@ -461,6 +462,7 @@ class PosixWriteableFile : public WritableFile {
return s;
}
};
#endif
static int LockOrUnlock(int fd, bool lock) {
errno = 0;
@ -524,6 +526,23 @@ class PosixEnv : public Env {
int fd = open(fname.c_str(), O_RDONLY);
if (fd < 0) {
s = IOError(fname, errno);
#if !defined(OS_MACOSX)
} else if (mmap_limit_.Acquire()) {
uint64_t size;
s = GetFileSize(fname, &size);
if (s.ok()) {
void* base = mmap(NULL, size, PROT_READ, MAP_SHARED, fd, 0);
if (base != MAP_FAILED) {
*result = new PosixMmapReadableFile(fname, base, size, &mmap_limit_);
} else {
s = IOError(fname, errno);
}
}
close(fd);
if (!s.ok()) {
mmap_limit_.Release();
}
#endif
} else {
*result = new PosixRandomAccessFile(fname, fd);
}
@ -538,7 +557,11 @@ class PosixEnv : public Env {
*result = NULL;
s = IOError(fname, errno);
} else {
#if defined(OS_MACOSX)
*result = new PosixWriteableFile(fname, fd);
#else
*result = new PosixMmapFile(fname, fd, page_size_);
#endif
}
return s;
}