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* Start of concurrent garbage collection. Processes write temporary

Browse source 
roots to a per-process temporary file in /nix/var/nix/temproots
  while holding a write lock on that file.  The garbage collector
  acquires read locks on all those files, thus blocking further
  progress in other Nix processes, and reads the sets of temporary
  roots.
This commit is contained in:
Eelco Dolstra 2005-01-31 10:27:25 +00:00
parent a7668411a1
commit 1328aa3307
11 changed files with 193 additions and 108 deletions
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13
src/libutil/util.cc
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@ -234,8 +234,8 @@ Path createTempDir()
void writeStringToFile(const Path & path, const string & s)
{
AutoCloseFD fd = open(path.c_str(),
O_CREAT | O_EXCL | O_WRONLY, 0666);
AutoCloseFD fd(open(path.c_str(),
O_CREAT | O_EXCL | O_WRONLY, 0666));
if (fd == -1)
throw SysError(format("creating file `%1%'") % path);
writeFull(fd, (unsigned char *) s.c_str(), s.size());
@ -375,6 +375,12 @@ AutoCloseFD::AutoCloseFD(int fd)
}
AutoCloseFD::AutoCloseFD(const AutoCloseFD & fd)
{
abort();
}
AutoCloseFD::~AutoCloseFD()
{
try {
@ -392,7 +398,7 @@ void AutoCloseFD::operator =(int fd)
}
AutoCloseFD::operator int()
AutoCloseFD::operator int() const
{
return fd;
}
@ -401,6 +407,7 @@ AutoCloseFD::operator int()
void AutoCloseFD::close()
{
if (fd != -1) {
debug(format("closing fd %1%") % fd);
if (::close(fd) == -1)
/* This should never happen. */
throw SysError("closing file descriptor");