Keep track of the number of build steps that are being built

Dependencies

• [2] WKJFPR77 hydra-queue-runner: Maintain count of active build steps
• [3] ENXUSMSV Make concurrency more robust
• [4] 5AIYUMTB Basic remote building
• [5] 24BMQDZA Start of single-process hydra-queue-runner
• [6] NJJ7H64S Very basic multi-threaded queue runner
• [7] RYTQLATY Keep track of failed paths in the Hydra database
• [8] OCZ4LSGG Automatically retry aborted builds
• [9] HHOMBU7G hydra-queue-runner: Implement timeouts
• [10] PQFOMNTL hydra-queue-runner: More stats
• [*] YZAI5GQU Implement a database connection pool

Change contents

• replacement in src/hydra-queue-runner/build-remote.cc at line 117
  [3.85]→[3.85:112](∅→∅)
  − RemoteResult & result)
  [3.85]

  [3.2925]
  + RemoteResult & result, counter & nrStepsBuilding)
• replacement in src/hydra-queue-runner/build-remote.cc at line 179
  [3.4400]→[3.4400:4429](∅→∅)
  − int res = readInt(from);
  [3.4400]

  [3.4429]
  + int res;

  + {

  + MaintainCount mc(nrStepsBuilding);

  + res = readInt(from);

  + }
• edit in src/hydra-queue-runner/build-remote.hh at line 5
  [3.5314]

  [3.5314]
  +

  + #include "counter.hh"
• replacement in src/hydra-queue-runner/build-remote.hh at line 25
  [3.295]→[3.295:323](∅→∅)
  − RemoteResult & result);
  [3.295]
  + RemoteResult & result, counter & nrStepsBuilding);
• file addition: counter.hh (----------)
  [3.187]
  + #pragma once

  +

  + #include <atomic>

  +

  + typedef std::atomic<unsigned int> counter;

  +

  + struct MaintainCount

  + {

  + counter & c;

  + MaintainCount(counter & c) : c(c) { c++; }

  + ~MaintainCount() { c--; }

  + };
• edit in src/hydra-queue-runner/hydra-queue-runner.cc at line 22
  [12.19]

  [3.19]
  + #include "counter.hh"
• edit in src/hydra-queue-runner/hydra-queue-runner.cc at line 45
  [3.907]→[3.0:1](∅→∅)
  −
• edit in src/hydra-queue-runner/hydra-queue-runner.cc at line 46
  [3.2]→[3.2:45](∅→∅)
  − typedef std::atomic<unsigned int> counter;
• edit in src/hydra-queue-runner/hydra-queue-runner.cc at line 47
  [3.908]→[2.84:204](∅→∅),[2.204]→[3.908:909](∅→∅),[3.908]→[3.908:909](∅→∅),[3.909]→[2.205:206](∅→∅)
  − struct MaintainCount

  − {

  − counter & c;

  − MaintainCount(counter & c) : c(c) { c++; }

  − ~MaintainCount() { c--; }

  − };

  −

  −
• edit in src/hydra-queue-runner/hydra-queue-runner.cc at line 246
  [2.237]

  [3.132]
  + counter nrStepsBuilding{0};
• replacement in src/hydra-queue-runner/hydra-queue-runner.cc at line 1089
  [3.1161]→[3.1161:1237](∅→∅)
  − logDir, build->maxSilentTime, build->buildTimeout, result);
  [3.1161]

  [3.1108]
  + logDir, build->maxSilentTime, build->buildTimeout, result, nrStepsBuilding);
• edit in src/hydra-queue-runner/hydra-queue-runner.cc at line 1427
  [2.351]

  [3.431]
  + printMsg(lvlError, format("%1% build steps currently building") % nrStepsBuilding);