Ucontexts and TLS don't play well together on this platform.
For the record, here is a sample test code. The output should be the same before and after
swapcontext (recall that option "-m64" may be mandatory to compile in 64bit mode).
--------------------
#include <iostream>
#include <stdexcept>
#include <system_error>
#include <thread>
#include <ucontext.h>
thread_local int x = 1;
static char stack[66536];
static ucontext_t ctx;
static ucontext_t octx;
static void wrap()
{
std::cerr << "o. After swapcontext...: x = " << x << " (" << std::this_thread::get_id() << ")\n";
}
static void thread_fun()
{
x = 2;
std::this_thread::sleep_for(std::chrono::milliseconds(100));
ctx.uc_stack.ss_sp = stack;
ctx.uc_stack.ss_size = sizeof(stack);
ctx.uc_link = &octx;
makecontext(&ctx, &wrap, 2, (int)0xdeadbeef);
std::cerr << "o. Before swapcontext..: x = " << x << " (" << std::this_thread::get_id() << ")\n";
swapcontext(&octx, &ctx);
std::cerr << "o. Finish of thread....: x = " << x << " (" << std::this_thread::get_id() << ")\n";
}
int main()
{
std::cerr << "x. Main (before thread): x = " << x << " (" << std::this_thread::get_id() << ")\n";
std::thread thr(thread_fun);
getcontext(&ctx);
thr.join();
std::cerr << "x. Main (after join)...: x = " << x << " (" << std::this_thread::get_id() << ")\n";
}
${CMAKE_HOME_DIRECTORY}/examples/deprecated/msg/${x}/${x}.tesh)
endforeach()
-ADD_TESH_FACTORIES(msg-dht-kademlia-parallel "thread;ucontext;raw;boost" --cfg contexts/nthreads:4 ${CONTEXTS_SYNCHRO}
+if(CMAKE_SYSTEM_NAME STREQUAL "SunOS" AND CMAKE_SYSTEM_PROCESSOR STREQUAL "i386" AND CMAKE_SIZEOF_VOID_P EQUAL 8)
+ # Thread-local storage (TLS) is needed for parallel execution, but it doesn't
+ # play well with Ucontexts on 64bit SunOS (at least on x86_64).
+ set(parallel-factories "thread;raw;boost")
+else()
+ set(parallel-factories "thread;ucontext;raw;boost")
+endif()
+ADD_TESH_FACTORIES(msg-dht-kademlia-parallel "${parallel-factories}" --cfg contexts/nthreads:4 ${CONTEXTS_SYNCHRO}
--setenv bindir=${CMAKE_BINARY_DIR}/examples/deprecated/msg/dht-kademlia
--setenv srcdir=${CMAKE_HOME_DIRECTORY}/examples/deprecated/msg/dht-kademlia
--setenv platfdir=${CMAKE_HOME_DIRECTORY}/examples/platforms