master updated (fa412cd -> b9031db)

[Christopher Baines]

cbaines pushed a change to branch master.

    from fa412cd  Alter the Builds table to have an id field
     new 0d23a6d  utils: Change critical section terminology to worker threads.
     new e34d773  Adjust make-worker-thread-channel to take an initializer.
     new faf4bfd  Enable make-worker-thread-channel to create multiple worker 
threads.
     new b9031db  database: Enable running up to 4 database queries at once.


Summary of changes:
 src/cuirass/base.scm     |  4 +-
 src/cuirass/database.scm | 99 ++++++++++++++++++++++--------------------------
 src/cuirass/utils.scm    | 57 ++++++++++++++--------------
 tests/database.scm       |  4 +-
 tests/http.scm           |  4 +-
 5 files changed, 82 insertions(+), 86 deletions(-)