nixos/nix
1
1
Fork 0
mirror of https://github.com/NixOS/nix.git synced 2025-11-15 06:52:43 +01:00
Code Activity

Pathlocks Implementation for Windows (#10586)

Browse source 
Based on Volth's original port.

Co-authored-by: volth <volth@volth.com>
This commit is contained in:
Dylan Green 2024-04-22 10:08:10 -05:00 • committed by GitHub
parent e1fd0e0a8c
commit aa165301d1
No known key found for this signature in database
GPG key ID: B5690EEEBB952194
7 changed files with 178 additions and 62 deletions
Download patch file Download diff file Expand all files Collapse all files

24
src/libstore/unix/pathlocks.cc
View file

@ -14,9 +14,7 @@
namespace nix {
using namespace nix::unix;
AutoCloseFD unix::openLockFile(const Path & path, bool create)
AutoCloseFD openLockFile(const Path & path, bool create)
{
AutoCloseFD fd;
@ -28,20 +26,20 @@ AutoCloseFD unix::openLockFile(const Path & path, bool create)
}
void unix::deleteLockFile(const Path & path, int fd)
void deleteLockFile(const Path & path, Descriptor desc)
{
/* Get rid of the lock file. Have to be careful not to introduce
races. Write a (meaningless) token to the file to indicate to
other processes waiting on this lock that the lock is stale
(deleted). */
unlink(path.c_str());
writeFull(fd, "d");
writeFull(desc, "d");
/* Note that the result of unlink() is ignored; removing the lock
file is an optimisation, not a necessity. */
}
bool unix::lockFile(int fd, LockType lockType, bool wait)
bool lockFile(Descriptor desc, LockType lockType, bool wait)
{
int type;
if (lockType == ltRead) type = LOCK_SH;
@ -50,7 +48,7 @@ bool unix::lockFile(int fd, LockType lockType, bool wait)
else abort();
if (wait) {
while (flock(fd, type) != 0) {
while (flock(desc, type) != 0) {
checkInterrupt();
if (errno != EINTR)
throw SysError("acquiring/releasing lock");
@ -58,7 +56,7 @@ bool unix::lockFile(int fd, LockType lockType, bool wait)
return false;
}
} else {
while (flock(fd, type | LOCK_NB) != 0) {
while (flock(desc, type | LOCK_NB) != 0) {
checkInterrupt();
if (errno == EWOULDBLOCK) return false;
if (errno != EINTR)
@ -149,16 +147,16 @@ void PathLocks::unlock()
}
FdLock::FdLock(int fd, LockType lockType, bool wait, std::string_view waitMsg)
: fd(fd)
FdLock::FdLock(Descriptor desc, LockType lockType, bool wait, std::string_view waitMsg)
: desc(desc)
{
if (wait) {
if (!lockFile(fd, lockType, false)) {
if (!lockFile(desc, lockType, false)) {
printInfo("%s", waitMsg);
acquired = lockFile(fd, lockType, true);
acquired = lockFile(desc, lockType, true);
}
} else
acquired = lockFile(fd, lockType, false);
acquired = lockFile(desc, lockType, false);
}