6944584: Improvements to subprocess handling on Unix
Summary: use thread pool for reaper thread; move most I/O operations out of reaper thread
Reviewed-by: michaelm, hiroshi
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// Sets the default values for platform dependent flags used by the runtime system.
// (see globals.hpp)
define_pd_global(bool, DontYieldALot, false);
#ifdef AMD64
define_pd_global(intx, ThreadStackSize, 1024); // 0 => use system default
define_pd_global(intx, VMThreadStackSize, 1024);
#else
// ThreadStackSize 320 allows a couple of test cases to run while
// keeping the number of threads that can be created high. System
// default ThreadStackSize appears to be 512 which is too big.
define_pd_global(intx, ThreadStackSize, 320);
define_pd_global(intx, VMThreadStackSize, 512);
#endif // AMD64
define_pd_global(intx, CompilerThreadStackSize, 0);
define_pd_global(uintx,JVMInvokeMethodSlack, 8192);
// Only used on 64 bit platforms
define_pd_global(uintx,HeapBaseMinAddress, 2*G);
// Only used on 64 bit Windows platforms
define_pd_global(bool, UseVectoredExceptions, false);