Justin C. Miller
724b846ee4
Multiple changes regarding channels. Mainly channels are now stream based and can handle partial reads or writes. Channels now use the kernel buffers area with the related buffer_cache. Added a fake stdout stream channel and kernel task to read its contents to the screen in preparation for handing channels as stdin/stdout to processes.
51 lines
1.5 KiB
C++
51 lines
1.5 KiB
C++
#pragma once
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/// \file channel.h
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/// Definition of channel objects and related functions
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#include "j6/signals.h"
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#include "kutil/bip_buffer.h"
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#include "objects/kobject.h"
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/// Channels are bi-directional means of sending messages
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class channel :
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public kobject
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{
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public:
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channel();
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virtual ~channel();
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/// Check if the channel has space for a message to be sent
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inline bool can_send() const { return check_signal(j6_signal_channel_can_send); }
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/// Check if the channel has a message wiating already
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inline bool can_receive() const { return check_signal(j6_signal_channel_can_recv); }
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/// Put a message into the channel
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/// \arg len [in] Bytes in data buffer [out] number of bytes written
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/// \arg data Pointer to the message data
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/// \returns j6_status_ok on success
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j6_status_t enqueue(size_t *len, const void *data);
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/// Get a message from the channel, copied into a provided buffer
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/// \arg len On input, the size of the provided buffer. On output,
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/// the size of the message copied into the buffer.
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/// \arg data Pointer to the buffer
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/// \returns j6_status_ok on success
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j6_status_t dequeue(size_t *len, void *data);
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/// Mark this channel as closed, all future calls to enqueue or
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/// dequeue messages will fail with j6_status_closed.
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void close();
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/// Check if this channel has been closed
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inline bool closed() { return check_signal(j6_signal_channel_closed); }
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protected:
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virtual void on_no_handles() override;
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private:
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size_t m_len;
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uintptr_t m_data;
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kutil::bip_buffer m_buffer;
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};
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