mirror of
https://github.com/justinian/jsix.git
synced 2025-12-10 00:14:32 -08:00
9fa588566f
This commit does a number of things to start the transition of channels from kernel to user space: - Remove channel objects / syscalls from the kernel - Add mutex type in libj6 - Add condition type in libj6 - Add a `ring` type flag for VMA syscalls to create ring buffers - Implement a rudimentary shared memory channel using all of the above
99 lines
2.3 KiB
C++
99 lines
2.3 KiB
C++
#include <j6/errors.h>
|
|
#include <util/node_map.h>
|
|
#include <util/spinlock.h>
|
|
|
|
#include "clock.h"
|
|
#include "logger.h"
|
|
#include "objects/process.h"
|
|
#include "objects/thread.h"
|
|
#include "vm_space.h"
|
|
|
|
using namespace obj;
|
|
|
|
namespace syscalls {
|
|
|
|
struct futex
|
|
{
|
|
uintptr_t address;
|
|
wait_queue queue;
|
|
|
|
futex() = default;
|
|
futex(futex &&other) :
|
|
address {other.address},
|
|
queue {std::move(other.queue)} {}
|
|
|
|
futex & operator=(futex &&other) {
|
|
address = other.address;
|
|
queue = std::move(other.queue);
|
|
return *this;
|
|
}
|
|
};
|
|
|
|
inline uint64_t & get_map_key(futex &f) { return f.address; }
|
|
|
|
util::node_map<uintptr_t, futex> g_futexes;
|
|
util::spinlock g_futexes_lock;
|
|
|
|
j6_status_t
|
|
futex_wait(const uint32_t *value, uint32_t expected, uint64_t timeout)
|
|
{
|
|
thread& t = thread::current();
|
|
process &p = t.parent();
|
|
|
|
if (*value != expected) {
|
|
log::spam(logs::syscall, "<%02x:%02x> futex %lx: %x != %x", p.obj_id(), t.obj_id(), value, *value, expected);
|
|
return j6_status_futex_changed;
|
|
}
|
|
|
|
uintptr_t address = reinterpret_cast<uintptr_t>(value);
|
|
vm_space &space = process::current().space();
|
|
uintptr_t phys = space.find_physical(address);
|
|
|
|
util::scoped_lock lock {g_futexes_lock};
|
|
|
|
futex &f = g_futexes[phys];
|
|
|
|
if (timeout) {
|
|
timeout += clock::get().value();
|
|
t.set_wake_timeout(timeout);
|
|
}
|
|
|
|
log::spam(logs::syscall, "<%02x:%02x> blocking on futex %lx", p.obj_id(), t.obj_id(), value);
|
|
|
|
lock.release();
|
|
f.queue.wait();
|
|
|
|
log::spam(logs::syscall, "<%02x:%02x> woke on futex %lx", p.obj_id(), t.obj_id(), value);
|
|
return j6_status_ok;
|
|
}
|
|
|
|
j6_status_t
|
|
futex_wake(const uint32_t *value, size_t count)
|
|
{
|
|
uintptr_t address = reinterpret_cast<uintptr_t>(value);
|
|
vm_space &space = process::current().space();
|
|
uintptr_t phys = space.find_physical(address);
|
|
|
|
util::scoped_lock lock {g_futexes_lock};
|
|
|
|
futex *f = g_futexes.find(phys);
|
|
if (f) {
|
|
if (count) {
|
|
for (unsigned i = 0; i < count; ++i) {
|
|
obj::thread *t = f->queue.pop_next();
|
|
if (!t) break;
|
|
t->wake();
|
|
}
|
|
} else {
|
|
f->queue.clear();
|
|
}
|
|
|
|
if (f->queue.empty())
|
|
g_futexes.erase(phys);
|
|
}
|
|
|
|
return j6_status_ok;
|
|
}
|
|
|
|
} // namespace syscalls
|