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POSIX ring buffer works on OSX and is simpler

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Andrew Kelley 2015-07-06 14:10:26 -07:00
parent a69ff6025c
commit 2b0744816f
2 changed files with 8 additions and 18 deletions
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1
README.md
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@ -99,7 +99,6 @@ make
## Roadmap ## Roadmap
0. sine example working with dummy backend osx
0. pipe record to playback example working with dummy linux, osx, windows 0. pipe record to playback example working with dummy linux, osx, windows
0. pipe record to playback example working with pulseaudio linux 0. pipe record to playback example working with pulseaudio linux
0. implement CoreAudio (OSX) backend, get examples working 0. implement CoreAudio (OSX) backend, get examples working

25
src/ring_buffer.cpp
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@ -16,6 +16,10 @@
#include <string.h> #include <string.h>
#include <errno.h> #include <errno.h>
#ifndef MAP_ANONYMOUS
#define MAP_ANONYMOUS MAP_ANON
#endif
struct SoundIoRingBuffer *soundio_ring_buffer_create(struct SoundIo *soundio, int requested_capacity) { struct SoundIoRingBuffer *soundio_ring_buffer_create(struct SoundIo *soundio, int requested_capacity) {
SoundIoRingBuffer *rb = create<SoundIoRingBuffer>(); SoundIoRingBuffer *rb = create<SoundIoRingBuffer>();
@ -88,34 +92,21 @@ int soundio_ring_buffer_init(struct SoundIoRingBuffer *rb, int requested_capacit
rb->write_offset = 0; rb->write_offset = 0;
rb->read_offset = 0; rb->read_offset = 0;
char shm_path[] = "/dev/shm/ring-buffer-XXXXXX"; rb->address = (char*)mmap(NULL, rb->capacity * 2, PROT_NONE,
int fd = mkstemp(shm_path); MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
if (fd < 0)
return SoundIoErrorSystemResources;
if (unlink(shm_path))
return SoundIoErrorSystemResources;
if (ftruncate(fd, rb->capacity))
return SoundIoErrorNoMem;
rb->address = (char*)mmap(NULL, rb->capacity * 2, PROT_NONE, MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
if (rb->address == MAP_FAILED) if (rb->address == MAP_FAILED)
return SoundIoErrorNoMem; return SoundIoErrorNoMem;
char *other_address = (char*)mmap(rb->address, rb->capacity, char *other_address = (char*)mmap(rb->address, rb->capacity,
PROT_READ|PROT_WRITE, MAP_FIXED|MAP_SHARED, fd, 0); PROT_READ|PROT_WRITE, MAP_ANONYMOUS|MAP_FIXED|MAP_SHARED, -1, 0);
if (other_address != rb->address) if (other_address != rb->address)
return SoundIoErrorNoMem; return SoundIoErrorNoMem;
other_address = (char*)mmap(rb->address + rb->capacity, rb->capacity, other_address = (char*)mmap(rb->address + rb->capacity, rb->capacity,
PROT_READ|PROT_WRITE, MAP_FIXED|MAP_SHARED, fd, 0); PROT_READ|PROT_WRITE, MAP_ANONYMOUS|MAP_FIXED|MAP_SHARED, -1, 0);
if (other_address != rb->address + rb->capacity) if (other_address != rb->address + rb->capacity)
return SoundIoErrorNoMem; return SoundIoErrorNoMem;
if (close(fd))
return SoundIoErrorSystemResources;
return 0; return 0;
} }