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libsysprof-capture: allow using ring in readwrite mode

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This is a first step to be able to use the ring buffer as the backing
buffer for the SysprofCaptureWriter.
This commit is contained in:
Christian Hergert
2020-02-15 22:50:22 -07:00
parent 36860b449e
commit 69e4fb2588
3 changed files with 40 additions and 5 deletions
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22
src/libsysprof-capture/mapped-ring-buffer.c
View File

@ -36,8 +36,9 @@
#define BUFFER_MAX_SIZE ((G_MAXUINT32/2)-_sysprof_getpagesize())
enum {
MODE_READER = 1,
MODE_WRITER = 2,
MODE_READER = 1,
MODE_WRITER = 2,
MODE_READWRITE = 3,
};
/*
@ -209,6 +210,17 @@ mapped_ring_buffer_new_reader (gsize buffer_size)
return g_steal_pointer (&self);
}
MappedRingBuffer *
mapped_ring_buffer_new_readwrite (gsize buffer_size)
{
MappedRingBuffer *self;
if ((self = mapped_ring_buffer_new_reader (buffer_size)))
self->mode = MODE_READWRITE;
return self;
}
/**
* mapped_ring_buffer_new_writer:
* @fd: a FD to map
@ -363,7 +375,7 @@ mapped_ring_buffer_allocate (MappedRingBuffer *self,
gsize tailpos;
g_return_val_if_fail (self != NULL, NULL);
g_return_val_if_fail (self->mode == MODE_WRITER, NULL);
g_return_val_if_fail (self->mode & MODE_WRITER, NULL);
g_return_val_if_fail (length > 0, NULL);
g_return_val_if_fail (length < self->body_size, NULL);
g_return_val_if_fail ((length & 0x7) == 0, NULL);
@ -419,7 +431,7 @@ mapped_ring_buffer_advance (MappedRingBuffer *self,
guint32 tail;
g_return_if_fail (self != NULL);
g_return_if_fail (self->mode == MODE_WRITER);
g_return_if_fail (self->mode & MODE_WRITER);
g_return_if_fail (length > 0);
g_return_if_fail (length < self->body_size);
g_return_if_fail ((length & 0x7) == 0);
@ -464,7 +476,7 @@ mapped_ring_buffer_drain (MappedRingBuffer *self,
gsize tailpos;
g_return_val_if_fail (self != NULL, FALSE);
g_return_val_if_fail (self->mode == MODE_READER, FALSE);
g_return_val_if_fail (self->mode & MODE_READER, FALSE);
g_return_val_if_fail (callback != NULL, FALSE);
header = get_header (self);

2
src/libsysprof-capture/mapped-ring-buffer.h
View File

@ -56,6 +56,8 @@ typedef gboolean (*MappedRingBufferCallback) (gconstpointer data,
G_GNUC_INTERNAL
MappedRingBuffer *mapped_ring_buffer_new_reader (gsize buffer_size);
G_GNUC_INTERNAL
MappedRingBuffer *mapped_ring_buffer_new_readwrite (gsize buffer_size);
G_GNUC_INTERNAL
MappedRingBuffer *mapped_ring_buffer_new_writer (gint fd);
G_GNUC_INTERNAL
gint mapped_ring_buffer_get_fd (MappedRingBuffer *self);