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b2b99e5b50
Estimated hours taken: 20
Improvements to coroutining support. These changes allow us to do
provide io primatives that cause the Mercury context to suspend rather
than causing the engine to block.
configure.in:
Test to see if we can handle contexts that block on IO
using select().
compiler/pragma_c_gen.m:
Include the predicate name in the calls to MR_OBTAIN_GLOBAL_C_LOCK
and MR_RELEASE_GLOBAL_C_LOCK for improved debugging.
Fix a bug where the global lock was not being released when
semidet pragma c code failed.
runtime/mercury_thread.h:
Change the global lock macros to include the message generated
by the changes to pragma_c_gen.
library/char.m:
library/std_util.m:
include `thread_safe' in the flags for a couple of pragma c
definitions that seem to have missed out.
runtime/mercury_context.{c,h}:
Add a list of "pending" contexts that are blocked on a
file descriptor. When the runqueue becomes empty, we call
select on all the pending contexts.
Move schedule from the header file to the c file (changing
it from a macro to a function) for easier debugging at a
slight performance cost.
TODO: add a nonblocking call to select so that we can poll
for io from time to time rather than waiting till there is
nothing else to do.
runtime/mercury_reg_workarounds.{c,h}:
Make functions that forward to the FD_* macros, which on Linux
attempt to use registers that we've already grabbed. Aarrggh!
runtime/mercury_thread.c:
Tidy up some of the conditional compilation.
runtime/mercury_types.h:
Remove the definition of SpinLock since we're not using them
and are not likely to any time soon.