Add Server-Sent Events support to the El runtime. El v2 handlers can now
hold HTTP connections open and push events in real time.
New builtins in el_seed.c:
__http_conn_fd() — retrieve raw fd from thread-local set by worker
__http_sse_open(fd) — send SSE headers (text/event-stream), keep-alive
__http_sse_send(fd, data) — write "data: <data>\n\n" frame
__http_sse_close(fd) — close the connection fd
http_worker_v2 in legacy/el_runtime.c now:
- stashes the fd via el_seed_set_http_conn_fd() before calling the handler
- detects the "__sse__" sentinel return value to skip http_send_response
and skip close(fd) — SSE handler took ownership of the fd
- clears the thread-local after the handler returns
El wrappers added to runtime/http.el:
http_conn_fd() http_sse_open(fd) http_sse_send(fd, data)
http_sse_close(fd) http_sse_sentinel()
el_seed.c now defines el_request_start/el_request_end directly (delegating
to its own seed arena) rather than declaring them as externs from el_runtime.c.
Header comment updated to reflect self-contained build.
Introduces el_seed.c / el_seed.h as the clean OS-boundary layer for new-generation
El programs. All public symbols use the __ prefix convention; el_val_t (int64_t) is
the universal value type throughout.
Key additions over el_runtime.c:
- __thread_create / __thread_join: pthreads + dlsym(RTLD_DEFAULT) parallelism
foundation. Static ElThread table (64 slots); worker resolves El fn symbols at
runtime, stores result string for join to return.
- __mutex_new / __mutex_lock / __mutex_unlock: pooled pthread_mutex_t handles
- __http_do: unified curl call with JSON headers string (vs ElMap) and explicit
timeout_ms parameter
- __fs_list_raw: returns newline-separated filename string (not ElList)
- __str_char_at: returns Int byte value (not single-char String)
- __args_json: CLI args as JSON array string; seeded by el_seed_init_args()
JSON, state, engram, HTML/URL, serve — thin __ wrappers over el_runtime.c.
Private seed arena (parallel to el_runtime.c arena) for standalone use.
Will Anderson