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Use a thread-safe pread/pwrite implementation for Windows

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This may be useful in future for concurrent calls to the same file.
This commit is contained in:
Andrea Mazzoleni 2016-01-03 20:15:28 +01:00
parent b619b9bee1
commit 0849bfc261
1 changed files with 14 additions and 14 deletions
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28
cmdline/mingw.c
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@ -1760,7 +1760,7 @@ off_t windows_lseek(int fd, off_t offset, int whence)
ssize_t windows_pread(int fd, void* buffer, size_t size, off_t offset)
{
HANDLE h;
LARGE_INTEGER pos;
OVERLAPPED overlapped;
DWORD count;
if (fd == -1) {
@ -1775,13 +1775,13 @@ ssize_t windows_pread(int fd, void* buffer, size_t size, off_t offset)
}
retry:
pos.QuadPart = offset;
if (!SetFilePointerEx(h, pos, 0, FILE_BEGIN)) {
windows_errno(GetLastError());
return -1;
}
overlapped.Internal = 0;
overlapped.InternalHigh = 0;
overlapped.Offset = offset & 0xFFFFFFFF;
overlapped.OffsetHigh = offset >> 32;
overlapped.hEvent = 0;
if (!ReadFile(h, buffer, size, &count, 0)) {
if (!ReadFile(h, buffer, size, &count, &overlapped)) {
DWORD err = GetLastError();
/*
* If Windows is not able to allocate memory from the PagedPool for the disk cache
@ -1818,7 +1818,7 @@ retry:
ssize_t windows_pwrite(int fd, const void* buffer, size_t size, off_t offset)
{
HANDLE h;
LARGE_INTEGER pos;
OVERLAPPED overlapped;
DWORD count;
if (fd == -1) {
@ -1833,13 +1833,13 @@ ssize_t windows_pwrite(int fd, const void* buffer, size_t size, off_t offset)
}
retry:
pos.QuadPart = offset;
if (!SetFilePointerEx(h, pos, 0, FILE_BEGIN)) {
windows_errno(GetLastError());
return -1;
}
overlapped.Internal = 0;
overlapped.InternalHigh = 0;
overlapped.Offset = offset & 0xFFFFFFFF;
overlapped.OffsetHigh = offset >> 32;
overlapped.hEvent = 0;
if (!WriteFile(h, buffer, size, &count, 0)) {
if (!WriteFile(h, buffer, size, &count, &overlapped)) {
DWORD err = GetLastError();
/* See windows_pread() for comments on this error management */
if (err == ERROR_NO_SYSTEM_RESOURCES) {