From efa5fa1a91d5c4b29094d99b65e18b583d86dbc7 Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <e.dolstra@tudelft.nl>
Date: Wed, 12 May 2004 14:20:32 +0000
Subject: * A switch `-j NUMBER' to set the maximum number of parallel jobs (0
 =   no limit). * Add missing file to distribution.

---
 src/libstore/globals.cc   |  2 ++
 src/libstore/globals.hh   |  3 +++
 src/libstore/normalise.cc | 13 ++++++++-----
 3 files changed, 13 insertions(+), 5 deletions(-)

(limited to 'src/libstore')

diff --git a/src/libstore/globals.cc b/src/libstore/globals.cc
index b3c658c29..e6105947f 100644
--- a/src/libstore/globals.cc
+++ b/src/libstore/globals.cc
@@ -9,3 +9,5 @@ string nixDBPath = "/UNINIT";
 bool keepFailed = false;
 
 Verbosity buildVerbosity = lvlDebug;
+
+unsigned int maxBuildJobs = 1;
diff --git a/src/libstore/globals.hh b/src/libstore/globals.hh
index 5d5e9efcf..020a7135b 100644
--- a/src/libstore/globals.hh
+++ b/src/libstore/globals.hh
@@ -32,5 +32,8 @@ extern bool keepFailed;
 /* Verbosity level for build output. */
 extern Verbosity buildVerbosity;
 
+/* Maximum number of parallel build jobs.  0 means unlimited. */
+extern unsigned int maxBuildJobs;
+
 
 #endif /* !__GLOBALS_H */
diff --git a/src/libstore/normalise.cc b/src/libstore/normalise.cc
index b6746689e..02089c929 100644
--- a/src/libstore/normalise.cc
+++ b/src/libstore/normalise.cc
@@ -284,6 +284,9 @@ bool Normaliser::startBuild(Path nePath)
 {
     checkInterrupt();
 
+    if (maxBuildJobs > 0 && building.size() >= maxBuildJobs)
+        return false;
+
     Goals::iterator goalIt = goals.find(nePath);
     assert(goalIt != goals.end());
     Goal & goal(goalIt->second);
@@ -414,11 +417,6 @@ bool Normaliser::startBuild(Path nePath)
             format("build hook died with status %1%") % status);
     }
 
-    /* Right platform? */
-    if (goal.expr.derivation.platform != thisSystem)
-        throw Error(format("a `%1%' is required, but I am a `%2%'")
-		    % goal.expr.derivation.platform % thisSystem);
-
     /* Otherwise, start the build in a child process. */
     startBuildChild(goal);
 
@@ -428,6 +426,11 @@ bool Normaliser::startBuild(Path nePath)
 
 void Normaliser::startBuildChild(Goal & goal)
 {
+    /* Right platform? */
+    if (goal.expr.derivation.platform != thisSystem)
+        throw Error(format("a `%1%' is required, but I am a `%2%'")
+		    % goal.expr.derivation.platform % thisSystem);
+
     /* If any of the outputs already exist but are not registered,
        delete them. */
     for (PathSet::iterator i = goal.expr.derivation.outputs.begin(); 
-- 
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