| // Copyright 2017 The Fuchsia Authors |
| // |
| // Use of this source code is governed by a MIT-style |
| // license that can be found in the LICENSE file or at |
| // https://opensource.org/licenses/MIT |
| |
| #pragma once |
| |
| #include <stdint.h> |
| |
| #include <object/dispatcher.h> |
| |
| #include <zircon/rights.h> |
| #include <zircon/types.h> |
| |
| #include <fbl/canary.h> |
| #include <fbl/mutex.h> |
| #include <fbl/ref_counted.h> |
| #include <lib/user_copy/user_ptr.h> |
| |
| class FifoDispatcher final : public PeeredDispatcher<FifoDispatcher, ZX_DEFAULT_FIFO_RIGHTS> { |
| public: |
| static zx_status_t Create(size_t elem_count, size_t elem_size, uint32_t options, |
| fbl::RefPtr<Dispatcher>* dispatcher0, |
| fbl::RefPtr<Dispatcher>* dispatcher1, |
| zx_rights_t* rights); |
| |
| ~FifoDispatcher() final; |
| |
| zx_obj_type_t get_type() const final { return ZX_OBJ_TYPE_FIFO; } |
| |
| zx_status_t WriteFromUser(size_t elem_size, user_in_ptr<const uint8_t> src, size_t count, |
| size_t* actual); |
| zx_status_t ReadToUser(size_t elem_size, user_out_ptr<uint8_t> dst, size_t count, |
| size_t* actual); |
| |
| // PeeredDispatcher implementation. |
| void on_zero_handles_locked() TA_REQ(get_lock()); |
| void OnPeerZeroHandlesLocked() TA_REQ(get_lock()); |
| |
| private: |
| FifoDispatcher(fbl::RefPtr<PeerHolder<FifoDispatcher>> holder, |
| uint32_t options, uint32_t elem_count, uint32_t elem_size, |
| ktl::unique_ptr<uint8_t[]> data); |
| void Init(fbl::RefPtr<FifoDispatcher> other); |
| zx_status_t WriteSelfLocked(size_t elem_size, user_in_ptr<const uint8_t> ptr, size_t count, |
| size_t* actual) TA_REQ(get_lock()); |
| zx_status_t UserSignalSelfLocked(uint32_t clear_mask, uint32_t set_mask) TA_REQ(get_lock()); |
| |
| fbl::Canary<fbl::magic("FIFO")> canary_; |
| const uint32_t elem_count_; |
| const uint32_t elem_size_; |
| const uint32_t mask_; |
| |
| uint32_t head_ TA_GUARDED(get_lock()); |
| uint32_t tail_ TA_GUARDED(get_lock()); |
| ktl::unique_ptr<uint8_t[]> data_ TA_GUARDED(get_lock()); |
| |
| static constexpr uint32_t kMaxSizeBytes = PAGE_SIZE; |
| }; |