rpcsx/kernel/cellos/include/cellos/sys_semaphore.h

#pragma once

#include "sys_sync.h"

#include "Emu/Memory/vm_ptr.h"

struct sys_semaphore_attribute_t {
  be_t<u32> protocol;
  be_t<u32> pshared;
  be_t<u64> ipc_key;
  be_t<s32> flags;
  be_t<u32> pad;

  union {
    nse_t<u64, 1> name_u64;
    char name[sizeof(u64)];
  };
};

struct lv2_sema final : lv2_obj {
  static const u32 id_base = 0x96000000;

  const lv2_protocol protocol;
  const u64 key;
  const u64 name;
  const s32 max;

  shared_mutex mutex;
  atomic_t<s32> val;
  ppu_thread *sq{};

  lv2_sema(u32 protocol, u64 key, u64 name, s32 max, s32 value) noexcept
      : protocol{static_cast<u8>(protocol)}, key(key), name(name), max(max),
        val(value) {}

  lv2_sema(utils::serial &ar);
  static std::function<void(void *)> load(utils::serial &ar);
  void save(utils::serial &ar);
};

// Aux
class ppu_thread;

// Syscalls

error_code sys_semaphore_create(ppu_thread &ppu, vm::ptr<u32> sem_id,
                                vm::ptr<sys_semaphore_attribute_t> attr,
                                s32 initial_val, s32 max_val);
error_code sys_semaphore_destroy(ppu_thread &ppu, u32 sem_id);
error_code sys_semaphore_wait(ppu_thread &ppu, u32 sem_id, u64 timeout);
error_code sys_semaphore_trywait(ppu_thread &ppu, u32 sem_id);
error_code sys_semaphore_post(ppu_thread &ppu, u32 sem_id, s32 count);
error_code sys_semaphore_get_value(ppu_thread &ppu, u32 sem_id,
                                   vm::ptr<s32> count);