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* True parallel builds. Nix can now run as many build jobs in

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parallel as possible (similar to GNU Make's `-j' switch).  This is
  useful on SMP systems, but it is especially useful for doing builds
  on multiple machines.  The idea is that a large derivation is
  initiated on one master machine, which then distributes
  sub-derivations to any number of slave machines.  This should not
  happen synchronously or in lock-step, so the master must be capable
  of dealing with multiple parallel build jobs.  We now have the
  infrastructure to support this.

  TODO: substitutes are currently broken.
This commit is contained in:
Eelco Dolstra 2004-05-11 18:05:44 +00:00
parent aea436503e
commit c8d3882cdc
12 changed files with 696 additions and 309 deletions
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22
src/libstore/pathlocks.cc
View file

@ -45,9 +45,24 @@ bool lockFile(int fd, LockType lockType, bool wait)
static StringSet lockedPaths; /* !!! not thread-safe */
PathLocks::PathLocks(const PathSet & _paths)
PathLocks::PathLocks()
: deletePaths(false)
{
}
PathLocks::PathLocks(const PathSet & paths)
: deletePaths(false)
{
lockPaths(paths);
}
void PathLocks::lockPaths(const PathSet & _paths)
{
/* May be called only once! */
assert(this->paths.empty());
/* Note that `fds' is built incrementally so that the destructor
will only release those locks that we have already acquired. */
@ -80,6 +95,8 @@ PathLocks::PathLocks(const PathSet & _paths)
/* Acquire an exclusive lock. */
lockFile(fd, ltWrite, true);
debug(format("lock acquired on `%1%'") % lockPath);
lockedPaths.insert(lockPath);
}
}
@ -88,7 +105,7 @@ PathLocks::PathLocks(const PathSet & _paths)
PathLocks::~PathLocks()
{
for (list<int>::iterator i = fds.begin(); i != fds.end(); i++)
close(*i);
if (close(*i) != 0) throw SysError("closing fd");
for (Paths::iterator i = paths.begin(); i != paths.end(); i++) {
checkInterrupt();
@ -99,6 +116,7 @@ PathLocks::~PathLocks()
the lock file is an optimisation, not a necessity. */
}
lockedPaths.erase(*i);
debug(format("lock released on `%1%'") % *i);
}
}