X-Git-Url: http://git.liburcu.org/?p=lttng-ust.git;a=blobdiff_plain;f=liblttng-ust%2Flttng-context-vtid.c;h=36e5695daf89143e1b28f01f600759d5adda5ab0;hp=15c11eddc6d096f2df2b4c106a5cb552999bf90f;hb=HEAD;hpb=fc80554e0cd4c7739c64fe8bc8b87a77d3c19d07

diff --git a/liblttng-ust/lttng-context-vtid.c b/liblttng-ust/lttng-context-vtid.c
deleted file mode 100644
index 15c11edd..00000000
--- a/liblttng-ust/lttng-context-vtid.c
+++ /dev/null
@@ -1,111 +0,0 @@
-/*
- * SPDX-License-Identifier: LGPL-2.1-only
- *
- * Copyright (C) 2009-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
- *
- * LTTng UST vtid context.
- */
-
-#define _LGPL_SOURCE
-#include <stddef.h>
-#include <sys/types.h>
-#include <unistd.h>
-#include <lttng/ust-events.h>
-#include <lttng/ust-tracer.h>
-#include <lttng/ringbuffer-config.h>
-#include <ust-tid.h>
-#include <urcu/tls-compat.h>
-
-#include "context-internal.h"
-#include "lttng-tracer-core.h"
-
-/*
- * We cache the result to ensure we don't trigger a system call for
- * each event.
- */
-static DEFINE_URCU_TLS(pid_t, cached_vtid);
-
-/*
- * Upon fork or clone, the TID assigned to our thread is not the same as
- * we kept in cache. Luckily, we are the only thread surviving in the
- * child process, so we can simply clear our cached version.
- */
-void lttng_context_vtid_reset(void)
-{
-	CMM_STORE_SHARED(URCU_TLS(cached_vtid), 0);
-}
-
-static
-size_t vtid_get_size(struct lttng_ctx_field *field, size_t offset)
-{
-	size_t size = 0;
-
-	size += lib_ring_buffer_align(offset, lttng_alignof(pid_t));
-	size += sizeof(pid_t);
-	return size;
-}
-
-static inline
-pid_t wrapper_getvtid(void)
-{
-	pid_t vtid;
-
-	vtid = CMM_LOAD_SHARED(URCU_TLS(cached_vtid));
-	if (caa_unlikely(!vtid)) {
-		vtid = lttng_gettid();
-		CMM_STORE_SHARED(URCU_TLS(cached_vtid), vtid);
-	}
-	return vtid;
-}
-
-static
-void vtid_record(struct lttng_ctx_field *field,
-		 struct lttng_ust_lib_ring_buffer_ctx *ctx,
-		 struct lttng_channel *chan)
-{
-	pid_t vtid = wrapper_getvtid();
-
-	lib_ring_buffer_align_ctx(ctx, lttng_alignof(vtid));
-	chan->ops->event_write(ctx, &vtid, sizeof(vtid));
-}
-
-static
-void vtid_get_value(struct lttng_ctx_field *field,
-		struct lttng_ctx_value *value)
-{
-	value->u.s64 = wrapper_getvtid();
-}
-
-int lttng_add_vtid_to_ctx(struct lttng_ctx **ctx)
-{
-	struct lttng_ctx_field *field;
-
-	field = lttng_append_context(ctx);
-	if (!field)
-		return -ENOMEM;
-	if (lttng_find_context(*ctx, "vtid")) {
-		lttng_remove_context_field(ctx, field);
-		return -EEXIST;
-	}
-	field->event_field.name = "vtid";
-	field->event_field.type.atype = atype_integer;
-	field->event_field.type.u.integer.size = sizeof(pid_t) * CHAR_BIT;
-	field->event_field.type.u.integer.alignment = lttng_alignof(pid_t) * CHAR_BIT;
-	field->event_field.type.u.integer.signedness = lttng_is_signed_type(pid_t);
-	field->event_field.type.u.integer.reverse_byte_order = 0;
-	field->event_field.type.u.integer.base = 10;
-	field->event_field.type.u.integer.encoding = lttng_encode_none;
-	field->get_size = vtid_get_size;
-	field->record = vtid_record;
-	field->get_value = vtid_get_value;
-	lttng_context_update(*ctx);
-	return 0;
-}
-
-/*
- * Force a read (imply TLS fixup for dlopen) of TLS variables.
- */
-void lttng_fixup_vtid_tls(void)
-{
-	asm volatile ("" : : "m" (URCU_TLS(cached_vtid)));
-}