diff options
Diffstat (limited to 'odb/details/win32/condition.cxx')
-rw-r--r-- | odb/details/win32/condition.cxx | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/odb/details/win32/condition.cxx b/odb/details/win32/condition.cxx new file mode 100644 index 0000000..93c396b --- /dev/null +++ b/odb/details/win32/condition.cxx @@ -0,0 +1,57 @@ +// file : odb/details/win32/condition.cxx +// author : Boris Kolpackov <boris@codesynthesis.com> +// copyright : Copyright (c) 2009-2010 Code Synthesis Tools CC +// license : GNU GPL v2; see accompanying LICENSE file + +#include <windows.h> + +#include <odb/details/win32/condition.hxx> +#include <odb/details/win32/exceptions.hxx> + +namespace odb +{ + namespace details + { + void condition:: + signal () + { + mutex_.lock (); + + if (waiters_ > signals_) + { + if (signals_++ == 0) + { + if (SetEvent (event_) == 0) + throw win32_exception (); + } + } + + mutex_.unlock (); + } + + void condition:: + wait () + { + // When we enter this functions the mutex is locked. When we + // return from this function the mutex must be locked. + // + waiters_++; + mutex_.unlock (); + + if (WaitForSingleObject (event_, INFINITE) != 0) + throw win32_exception (); + + mutex_.lock (); + waiters_--; + signals_--; + + if (signals_ > 0) + { + // Wake up the next thread. + // + if (SetEvent (event_) == 0) + throw win32_exception (); + } + } + } +} |