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/******************************************************************************\
* ___ __ *
* /\_ \ __/\ \ *
* \//\ \ /\_\ \ \____ ___ _____ _____ __ *
* \ \ \ \/\ \ \ '__`\ /'___\/\ '__`\/\ '__`\ /'__`\ *
* \_\ \_\ \ \ \ \L\ \/\ \__/\ \ \L\ \ \ \L\ \/\ \L\.\_ *
* /\____\\ \_\ \_,__/\ \____\\ \ ,__/\ \ ,__/\ \__/.\_\ *
* \/____/ \/_/\/___/ \/____/ \ \ \/ \ \ \/ \/__/\/_/ *
* \ \_\ \ \_\ *
* \/_/ \/_/ *
* *
* Copyright (C) 2011-2013 *
* Dominik Charousset <dominik.charousset@haw-hamburg.de> *
* *
* This file is part of libcppa. *
* libcppa is free software: you can redistribute it and/or modify it under *
* the terms of the GNU Lesser General Public License as published by the *
* Free Software Foundation; either version 2.1 of the License, *
* or (at your option) any later version. *
* *
* libcppa is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. *
* See the GNU Lesser General Public License for more details. *
* *
* You should have received a copy of the GNU Lesser General Public License *
* along with libcppa. If not, see <http://www.gnu.org/licenses/>. *
\******************************************************************************/
#include <cstdint>
#include <stdexcept>
#include "cppa/detail/cs_thread.hpp"
namespace {
typedef void* vptr;
typedef void (*cst_fun)(vptr);
} // namespace <anonmyous>
#ifdef CPPA_DISABLE_CONTEXT_SWITCHING
namespace cppa { namespace detail {
cs_thread::cs_thread() : m_impl(nullptr) { }
cs_thread::cs_thread(cst_fun, vptr) : m_impl(nullptr) { }
cs_thread::~cs_thread() { }
void cs_thread::swap(cs_thread&, cs_thread&) {
throw std::logic_error("libcppa was compiled using "
"CPPA_DISABLE_CONTEXT_SWITCHING");
}
const bool cs_thread::is_disabled_feature = true;
} } // namespace cppa::detail
#else // ifdef CPPA_DISABLE_CONTEXT_SWITCHING
// optional valgrind include
#ifdef CPPA_ANNOTATE_VALGRIND
# include <valgrind/valgrind.h>
#endif
// boost includes
#include <boost/version.hpp>
#include <boost/context/all.hpp>
#if BOOST_VERSION >= 105300
# include <boost/coroutine/all.hpp>
#endif
namespace cppa { namespace detail {
void cst_trampoline(intptr_t iptr);
namespace {
#if CPPA_ANNOTATE_VALGRIND
typedef int vg_member;
inline void vg_register(vg_member& stack_id, vptr ptr1, vptr ptr2) {
stack_id = VALGRIND_STACK_REGISTER(ptr1, ptr2);
}
inline void vg_deregister(vg_member stack_id) {
VALGRIND_STACK_DEREGISTER(stack_id);
}
#else
struct vg_member { };
inline void vg_register(vg_member&, vptr, vptr) {/*NOP*/}
inline void vg_deregister(const vg_member&) { }
#endif
/* Interface dependent on Boost version:
*
* === namespace aliases ===
*
* ctxn:
* namespace of context library; alias for boost::context or boost::ctx
*
* === types ===
*
* context:
* execution context; either fcontext_t or fcontext_t*
*
* converted_context:
* additional member for converted_cs_thread;
* needed if context is defined as fcontext_t*
*
* ctx_stack_info:
* result of new_stack(), needed to delete stack properly in some versions
*
* stack_allocator:
* a stack allocator for cs_thread instances
*
* === functions ===
*
* void init_converted_context(converted_context&, context&)
*
* void ctx_switch(context&, context&, cst_impl*):
* implements the context switching from one cs_thread to another
*
* ctx_stack_info new_stack(context&, stack_allocator&, vg_member&):
* allocates a stack, prepares execution of context
* and (optionally) registers the new stack to valgrind
*
* void del_stack(stack_allocator&, ctx_stack_info, vg_member&):
* destroys the stack and (optionally) deregisters it from valgrind
*/
#if BOOST_VERSION == 105100
// === namespace aliases ===
namespace ctxn = boost::ctx;
// === types ===
typedef ctxn::fcontext_t context;
struct converted_context { };
typedef int ctx_stack_info;
typedef ctxn::stack_allocator stack_allocator;
// === functions ===
inline void init_converted_context(converted_context&, context&) {/*NOP*/}
inline void ctx_switch(context& from, context& to, cst_impl* ptr) {
ctxn::jump_fcontext(&from, &to, (intptr_t) ptr);
}
ctx_stack_info new_stack(context& ctx,
stack_allocator& alloc,
vg_member& vgm) {
size_t mss = ctxn::minimum_stacksize();
ctx.fc_stack.base = alloc.allocate(mss);
ctx.fc_stack.limit = reinterpret_cast<vptr>(
reinterpret_cast<intptr_t>(ctx.fc_stack.base) - mss);
ctxn::make_fcontext(&ctx, cst_trampoline);
vg_register(vgm,
ctx.fc_stack.base,
reinterpret_cast<vptr>(
reinterpret_cast<intptr_t>(ctx.fc_stack.base) - mss));
return 0; // dummy value
}
inline void del_stack(stack_allocator&, ctx_stack_info, vg_member& vgm) {
vg_deregister(vgm);
}
#elif BOOST_VERSION < 105400
// === namespace aliases ===
namespace ctxn = boost::context;
// === types ===
typedef ctxn::fcontext_t* context;
typedef ctxn::fcontext_t converted_context;
typedef int ctx_stack_info;
# if BOOST_VERSION < 105300
typedef ctxn::guarded_stack_allocator stack_allocator;
# else
typedef boost::coroutines::stack_allocator stack_allocator;
# endif
// === functions ===
inline void init_converted_context(converted_context& cctx, context& ctx) {
ctx = &cctx;
}
inline void ctx_switch(context& from, context& to, cst_impl* ptr) {
ctxn::jump_fcontext(from, to, (intptr_t) ptr);
}
ctx_stack_info new_stack(context& ctx,
stack_allocator& alloc,
vg_member& vgm) {
size_t mss = stack_allocator::minimum_stacksize();
ctx = ctxn::make_fcontext(alloc.allocate(mss), mss, cst_trampoline);
vg_register(vgm,
ctx->fc_stack.sp,
reinterpret_cast<vptr>(
reinterpret_cast<intptr_t>(ctx->fc_stack.sp) - mss));
return 0; // dummy value
}
inline void del_stack(stack_allocator&, ctx_stack_info, vg_member& vgm) {
vg_deregister(vgm);
}
#else // BOOST_VERSION >= 105400
// === namespace aliases ===
namespace ctxn = boost::context;
// === types ===
typedef ctxn::fcontext_t* context;
typedef ctxn::fcontext_t converted_context;
typedef boost::coroutines::stack_context ctx_stack_info;
typedef boost::coroutines::stack_allocator stack_allocator;
// === functions ===
inline void init_converted_context(converted_context& cctx, context& ctx) {
ctx = &cctx;
}
inline void ctx_switch(context& from, context& to, cst_impl* ptr) {
ctxn::jump_fcontext(from, to, (intptr_t) ptr);
}
ctx_stack_info new_stack(context& ctx,
stack_allocator& alloc,
vg_member& vgm) {
size_t mss = stack_allocator::minimum_stacksize();
ctx_stack_info sinf;
alloc.allocate(sinf, mss);
ctx = ctxn::make_fcontext(sinf.sp, sinf.size, cst_trampoline);
vg_register(vgm,
ctx->fc_stack.sp,
reinterpret_cast<vptr>(
reinterpret_cast<intptr_t>(ctx->fc_stack.sp) - mss));
return sinf;
}
inline void del_stack(stack_allocator& alloc,
ctx_stack_info sctx,
vg_member& vgm) {
vg_deregister(vgm);
alloc.deallocate(sctx);
}
#endif
} // namespace <anonymous>
// base class for cs_thread pimpls
struct cst_impl {
cst_impl() : m_ctx() { }
virtual ~cst_impl() { }
virtual void run() = 0;
inline void swap(cst_impl* to) {
ctx_switch(m_ctx, to->m_ctx, to);
}
context m_ctx;
};
// a cs_thread representing a thread ('converts' the thread to a cs_thread)
struct converted_cs_thread : cst_impl {
converted_cs_thread() {
init_converted_context(m_converted, m_ctx);
}
void run() override {
throw std::logic_error("converted_cs_thread::run called");
}
converted_context m_converted;
};
// a cs_thread executing a function
struct fun_cs_thread : cst_impl {
fun_cs_thread(cst_fun fun, vptr arg) : m_fun(fun), m_arg(arg) {
m_stack_info = new_stack(m_ctx, m_alloc, m_vgm);
}
~fun_cs_thread() {
del_stack(m_alloc, m_stack_info, m_vgm);
}
void run() override {
m_fun(m_arg);
}
cst_fun m_fun; // thread function
vptr m_arg; // argument for thread function invocation
stack_allocator m_alloc; // allocates memory for our stack
vg_member m_vgm; // valgrind meta informations (optionally)
ctx_stack_info m_stack_info; // needed to delete stack in destructor
};
void cst_trampoline(intptr_t iptr) {
auto ptr = (cst_impl*) iptr;
ptr->run();
}
cs_thread::cs_thread() : m_impl(new converted_cs_thread) { }
cs_thread::cs_thread(cst_fun f, vptr x) : m_impl(new fun_cs_thread(f, x)) { }
void cs_thread::swap(cs_thread& from, cs_thread& to) {
from.m_impl->swap(to.m_impl);
}
cs_thread::~cs_thread() {
delete m_impl;
}
const bool cs_thread::is_disabled_feature = false;
} } // namespace cppa::detail
#endif // CPPA_DISABLE_CONTEXT_SWITCHING
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