--- /dev/null
+/*
+ * (C) Copyright 2009-2011 -
+ * Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ *
+ * LTTng UST pthread_id context.
+ *
+ * Dual LGPL v2.1/GPL v2 license.
+ */
+
+#include <pthread.h>
+#include <ust/lttng-events.h>
+#include <ust/lttng-tracer.h>
+#include <ust/ringbuffer-config.h>
+
+static
+size_t pthread_id_get_size(size_t offset)
+{
+ size_t size = 0;
+
+ size += lib_ring_buffer_align(offset, lttng_alignof(pid_t));
+ size += sizeof(pid_t);
+ return size;
+}
+
+static
+void pthread_id_record(struct lttng_ctx_field *field,
+ struct lib_ring_buffer_ctx *ctx,
+ struct ltt_channel *chan)
+{
+ unsigned long pthread_id;
+
+ pthread_id = (unsigned long) pthread_self();
+ lib_ring_buffer_align_ctx(ctx, lttng_alignof(pthread_id));
+ chan->ops->event_write(ctx, &pthread_id, sizeof(pthread_id));
+}
+
+int lttng_add_pthread_id_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, "pthread_id")) {
+ lttng_remove_context_field(ctx, field);
+ return -EEXIST;
+ }
+ field->event_field.name = "pthread_id";
+ field->event_field.type.atype = atype_integer;
+ field->event_field.type.u.basic.integer.size = sizeof(pid_t) * CHAR_BIT;
+ field->event_field.type.u.basic.integer.alignment = lttng_alignof(pid_t) * CHAR_BIT;
+ field->event_field.type.u.basic.integer.signedness = lttng_is_signed_type(pid_t);
+ field->event_field.type.u.basic.integer.reverse_byte_order = 0;
+ field->event_field.type.u.basic.integer.base = 10;
+ field->event_field.type.u.basic.integer.encoding = lttng_encode_none;
+ field->get_size = pthread_id_get_size;
+ field->record = pthread_id_record;
+ return 0;
+}